悪い (warui) conjugation
bad, sinful; inferior
悪い (わるい, warui) is an i-adjective. I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 悪い warui | 悪いです waruidesu | The form you look up. Also the casual “is ~”. |
| Negative | 悪くない warukunai | 悪くないです warukunaidesu | “is not ~”. |
| Past | 悪かった warukatta | 悪かったです warukattadesu | “was ~”. |
| Past negative | 悪くなかった warukunakatta | 悪くなかったです warukunakattadesu | “was not ~”. |
| Te-form | 悪くて warukute | — | Links to the next clause: “~ and …”. |
| Adverb | 悪く waruku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 悪い〜 warui〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 悪ければ warukereba | — | “if it is ~”. |
| Conditional (~たら) | 悪かったら warukattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 悪くなる warukunaru | 悪くなります warukunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 悪すぎる warusugiru | 悪すぎます warusugimasu | “too ~”. |
| Looks ~ (~そう) | 悪そう warusou | 悪そうです warusoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
See the full rules in the adjective conjugation guide.