無口 (mukuchi) conjugation
reticence
無口 (むくち, mukuchi) 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 | 無口だ mukuchida | 無口です mukuchidesu | The form you look up. Also the casual “is ~”. |
| Negative | 無口じゃない mukuchijanai | 無口じゃないです mukuchijanaidesu | “is not ~”. |
| Past | 無口だった mukuchidatta | 無口でした mukuchideshita | “was ~”. |
| Past negative | 無口じゃなかった mukuchijanakatta | 無口じゃなかったです mukuchijanakattadesu | “was not ~”. |
| Te-form | 無口で mukuchide | — | Links to the next clause: “~ and …”. |
| Adverb | 無口に mukuchini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 無口な〜 mukuchina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 無口なら mukuchinara | — | “if it is ~”. |
| Conditional (~たら) | 無口だったら mukuchidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 無口になる mukuchininaru | 無口になります mukuchininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 無口すぎる mukuchisugiru | 無口すぎます mukuchisugimasu | “too ~”. |
| Looks ~ (~そう) | 無口そう mukuchisou | 無口そうです mukuchisoudesu | “looks / seems ~” from appearance. |
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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.