LESSON NOTES · レッスンノート

N5Lesson notes · Sep 30, 2026

Really in Japanese: 本当ほんとうに, ほんと?, マジ? — the reaction and the intensifier

"Really" in Japanese is not one word — it does two different jobs, and each job has its own set: 本当ほんとう? / ほんと? / マジ? / そうなんですか for the reaction, and 本当ほんとうに / すごく / とても / めっちゃ for the intensifier.

Most learners look up "really in japanese", get 本当ほんとうに, and use it for everything. That works for half of English "really." The other half — the little "Really?" you say when a friend tells you news — needs a different word entirely, and getting it wrong is how people end up sounding either blunt or oddly stiff.

The basics

What are the two jobs of "really"?

English "really" is either a reaction ("Really?") or a volume knob ("really good"), and Japanese uses different words for each.

  • Job 1, the reaction: you heard something surprising and you respond. "I got the job." — "Really?"
  • Job 2, the intensifier: you make an adjective or verb stronger. "This ramen is really good."

In English the word is identical, so we never notice the split. In Japanese the split is the whole lesson. If you say 本当ほんとうに? as a reaction it sounds a little unfinished, and if you use ほんと? before an adjective it just does not work.

How do you say "Really?" as a reaction?

Say 本当ほんとう? (hontou?) or, in casual speech, ほんと? — a noun-style "is it true?" with rising intonation.

本当ほんとう? — Really? (neutral, safe with most people you know) ほんと? — Really? (casual, the everyday spoken version) えっ、うそ! — No way! (surprise, not an accusation)

That third one trips people up. うそ literally means "a lie," so learners worry they are calling the speaker a liar. They are not. えっ、うそ! is pure surprise, the same energy as "No way!" or "You're kidding!" in English. The tone of voice carries it, and nobody hears it as an insult.

What if you are talking to someone you should be polite to?

Use そうなんですか — it is the polite "Really?" and it sounds more natural than 本当ほんとう? to a boss, a teacher, or a stranger.

そうなんですか。 — Oh, is that so? / Really? (polite, safe with anyone) 本当ほんとうですか。 — Is that true? (polite, but can sound like you doubt them)

Here is the catch. 本当ほんとうですか is grammatically polite, but it asks "is that actually true?" — and to someone senior, that can sound like you are checking their facts. そうなんですか just receives the information: "oh, I see, that's how it is." When you want to react without challenging anyone, そうなんですか is the default. For the wider question of when to switch registers, see keigo vs casual Japanese.

How do you say "really good" or "really tired"?

Put 本当ほんとうに in front — 本当ほんとうに美味おいしい, 本当ほんとうに疲つかれた — or swap in すごく / とても / めっちゃ depending on how casual you are.

このラーメン、本当ほんとうに美味おいしい。 — This ramen is really delicious. (neutral, sincere) 今日きょうはすごく疲つかれた。 — I'm really tired today. (neutral to casual, everyday) その映画えいが、めっちゃ面白おもしろかった。 — That movie was really good. (casual, very common, Kansai-flavored but used everywhere)

本当ほんとうに adds a feeling of sincerity — "truly," "genuinely." すごく is the plain volume knob. とても is the polite, slightly textbook one. めっちゃ is casual and energetic.

Beyond the basics

What is the difference between 本当ほんとうに and 本当ほんとうの?

本当ほんとうに is an adverb that modifies a verb or adjective; 本当ほんとうの is a noun modifier that goes before a noun. They are not interchangeable.

本当ほんとうに好すきです。 — I really like it. (polite, 本当ほんとうに modifies 好すき) 本当ほんとうの理由りゆうを教おしえて。 — Tell me the real reason. (casual, 本当ほんとうの modifies 理由りゆう)

Ask yourself what comes next. Adjective or verb next: 本当ほんとうに. Noun next: 本当ほんとうの. Mixing them up (本当ほんとうに理由りゆう) is one of the most common slips in lessons, because English "real" and "really" look so alike that the difference feels invisible.

Where does マジ fit?

マジ is the casual, slangy word that works for both jobs — マジ? as a reaction and マジで as an intensifier.

マジ? — Seriously? (casual, friends only) マジで美味おいしい。 — It's seriously delicious. (casual, friends only)

マジ is a shortened 真面目まじめ ("serious"), and it is close in feel to the word in our article on honki, meaning serious. Keep it for friends and never use it with a boss or in writing.

How does "Really?" sound in anime?

Anime characters almost never use the textbook 本当ほんとうですか — they use ほんと?, マジ?, えっ?, and a lot of bare rising sounds like え? and へえ.

A character hears a surprising rumor and says ほんと? with wide eyes. A rival hears a claim and says マジかよ, which is the rough, boyish version. A polite side character responds with そうなんですね. If you want to sound like a real person rather than a phrasebook, notice that a huge share of "Really?" in Japanese is not a word at all — it is a sound, an えっ, a へえ, an あ、そうなの. Our article on Japanese filler words covers those sounds.

Can "Really?" keep the conversation going?

Yes, and this is the secret job of the reaction: it shows you are listening and invites the speaker to say more.

In English a flat "Really?" often ends the exchange. In Japanese, a good reaction is a small nudge: ほんと? それでどうなったの? ("Really? So what happened?") is a classic pairing. If you want more of these, see two questions that keep a conversation alive.

ほんと? それでどうなったの? — Really? So what happened? (casual, friend telling a story) そうなんですか。 それは大変たいへんでしたね。 — Oh, is that so? That must have been hard. (polite, showing sympathy)

What about "not really" and "really?" as doubt?

"Not really" is あんまり〜ない or そんなに〜ない, and doubtful "Really?" is 本当ほんとうかな — not the same words as the reaction.

あんまり好すきじゃない。 — I don't really like it. (casual, softens a no) 本当ほんとうかな。 — Is that really true, though? (casual, doubtful, said half to yourself)

The "not really" of English is another separate job again. It is not 本当ほんとうに anything. It uses a different softening word entirely.

How to practise it

For a week, sort every "really" you say in English into Job 1 or Job 2 before you translate it. Reaction: ほんと? / そうなんですか. Intensifier: すごく / 本当ほんとうに / めっちゃ. Do not translate the word — translate the job.

Then listen for the split in anime. Pause when a character reacts and ask: was that a real word, or a sound? You will be surprised how often it is a sound.

Common mistakes

  • Using 本当ほんとうに as a reaction. 本当ほんとうに? sounds unfinished. Use 本当ほんとう? or ほんと?.
  • Using 本当ほんとうですか to a boss. It can sound like "are you sure that's true?" Use そうなんですか instead.
  • Reading えっ、うそ! as an accusation. It is surprise, not "you are lying."
  • Writing 本当ほんとうに理由りゆう. 本当ほんとうに is an adverb. Before a noun, use 本当ほんとうの.
  • Using マジ with someone senior. It is friends-only slang. For its cousin word, see yabai, another slang word that is easy to misuse.

The register table

Job Casual Neutral Polite
Reaction (surprise) マジ? / えっ、うそ! ほんと? / 本当ほんとう? そうなんですか
Reaction (doubt) 本当ほんとうかな 本当ほんとう? 本当ほんとうですか
Intensifier (very) めっちゃ / マジで すごく / 本当ほんとうに とても / 本当ほんとうに
Intensifier + noun 本当ほんとうの〜 本当ほんとうの〜 本当ほんとうの〜

FAQ

Is ほんと the same word as 本当ほんとう? Yes. ほんと is the casual, spoken way to say 本当ほんとう. In writing and formal speech you see 本当ほんとう.

Is saying えっ、うそ! rude? No. It means "No way!" and expresses surprise. It is casual, so keep it for friends and family.

Can 本当ほんとうに alone work as a reaction? Not on its own as a reaction. 本当ほんとうに is an adverb that needs an adjective or verb after it. For the reaction, use 本当ほんとう? or ほんと?.

Which "Really?" is the most natural in polite speech? そうなんですか. It receives what the speaker said without questioning whether it is true.

What is the difference between すごく and めっちゃ? Both mean "really" or "very." すごく is neutral and works nearly everywhere. めっちゃ is casual and energetic, common with friends.

Practice

Decide which job "really" is doing before you answer. Questions 6 and 7 are a pair — same sound, opposite jobs.

1. A friend says "I passed the exam." Give a casual "Really?"

Show answer

ほんと? — the everyday casual reaction. マジ? also works with a close friend.

2. Your boss says the meeting moved to Friday. What is the safest polite "Really?"

Show answer

そうなんですか — it receives the information without sounding like you doubt it, which 本当ほんとうですか can.

3. A friend says something shocking. You say えっ、うそ! Are you calling them a liar?

Show answer

No — it is surprise, the same as "No way!" in English. Tone makes it clear.

4. Say "This ramen is really delicious" in a neutral, sincere way.

Show answer

このラーメン、本当ほんとうに美味おいしい — 本当ほんとうに is an adverb placed before the adjective.

5. Say "That movie was really good" casually.

Show answer

その映画えいが、めっちゃ面白おもしろかった — めっちゃ is the casual intensifier. すごく面白おもしろかった is the neutral version.

6. Which is correct: 本当ほんとうに理由りゆう or 本当ほんとうの理由りゆう?

Show answer

本当ほんとうの理由りゆう — a noun follows, so you need the noun modifier 本当ほんとうの. 本当ほんとうに modifies verbs and adjectives.

7. Which is correct: 本当ほんとうの好すきです or 本当ほんとうに好すきです?

Show answer

本当ほんとうに好すきです — 好すき works like an adjective here, so the adverb 本当ほんとうに is right. This is the pair to question 6.

8. Why is マジで not safe with a teacher?

Show answer

It is friends-only slang — it is too casual for someone senior. Use とても or 本当ほんとうに instead.

9. Give a "Really?" plus a follow-up that keeps the conversation going.

Show answer

ほんと? それでどうなったの? — the reaction shows you listened and the follow-up invites the story to continue.

During a trial lesson, react to a surprising story with 本当ほんとう? and マジ?, then use 本当ほんとうに and すごく to stress your own feelings.

Vocabulary from this article

Tap the block to select all of it, then copy. In Anki: File → Import, note type Basic, separator Tab — the first column becomes the front, the second the back.

本当	ほんとう — true, real
ほんと	ほんと — really (casual for 本当)
本当に	ほんとうに — really, truly
そうなんですか	そうなんですか — oh, is that so? (polite)
うそ	うそ — lie; no way!
すごく	すごく — very, really
とても	とても — very (polite)
めっちゃ	めっちゃ — really (casual)
マジ	マジ — seriously (slang)
理由	りゆう — reason
美味しい	おいしい — delicious
疲れる	つかれる — to get tired
面白い	おもしろい — interesting, funny
あんまり	あんまり — not very (with negative)

I'm Yuuki, a Japanese teacher based in Tokyo. I've taught on italki as a Top 1% teacher and watched over 1,500 anime, so most of the example sentences on this blog come from lines I've actually heard students ask about — including this one, where the split between the reaction and the intensifier clears up a lot of confusion at once. For practice with feedback, Book a trial lesson · $13, or work through Japanese practice exercises first.

Sources: the author's own lessons and standard reference grammars.

More drills like the ones above, plus a timed JLPT-style mock test: Practice · N5 · Read something at this level: JLPT N5 stories with audio

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