無用 (muyou) conjugation
useless, needlessness, unnecessariness
無用 (むよう, muyou) 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 | 無用だ muyouda | 無用です muyoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 無用じゃない muyoujanai | 無用じゃないです muyoujanaidesu | “is not ~”. |
| Past | 無用だった muyoudatta | 無用でした muyoudeshita | “was ~”. |
| Past negative | 無用じゃなかった muyoujanakatta | 無用じゃなかったです muyoujanakattadesu | “was not ~”. |
| Te-form | 無用で muyoude | — | Links to the next clause: “~ and …”. |
| Adverb | 無用に muyouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 無用な〜 muyouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 無用なら muyounara | — | “if it is ~”. |
| Conditional (~たら) | 無用だったら muyoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 無用になる muyouninaru | 無用になります muyouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 無用すぎる muyousugiru | 無用すぎます muyousugimasu | “too ~”. |
| Looks ~ (~そう) | 無用そう muyousou | 無用そうです muyousoudesu | “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.