夢中 (muchuu) conjugation
crush, crazy, be hooked on
夢中 (むちゅう, muchuu) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 夢中だ muchuuda | 夢中です muchuudesu | The form you look up. Also the casual “is ~”. |
| Negative | 夢中じゃない muchuujanai | 夢中じゃないです muchuujanaidesu | “is not ~”. |
| Past | 夢中だった muchuudatta | 夢中でした muchuudeshita | “was ~”. |
| Past negative | 夢中じゃなかった muchuujanakatta | 夢中じゃなかったです muchuujanakattadesu | “was not ~”. |
| Te-form | 夢中で muchuude | — | Links to the next clause: “~ and …”. |
| Adverb | 夢中に muchuuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 夢中な〜 muchuuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 夢中なら muchuunara | — | “if it is ~”. |
| Conditional (~たら) | 夢中だったら muchuudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 夢中になる muchuuninaru | 夢中になります muchuuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 夢中すぎる muchuusugiru | 夢中すぎます muchuusugimasu | “too ~”. |
| Looks ~ (~そう) | 夢中そう muchuusou | 夢中そうです muchuusoudesu | “looks / seems ~” from appearance. |
🔊 Tap any Japanese word to hear it spoken.
Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.