詳しい (kuwashii) conjugation
detailed; full; accurate
詳しい (くわしい, kuwashii) 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 | 詳しい kuwashii | 詳しいです kuwashiidesu | The form you look up. Also the casual “is ~”. |
| Negative | 詳しくない kuwashikunai | 詳しくないです kuwashikunaidesu | “is not ~”. |
| Past | 詳しかった kuwashikatta | 詳しかったです kuwashikattadesu | “was ~”. |
| Past negative | 詳しくなかった kuwashikunakatta | 詳しくなかったです kuwashikunakattadesu | “was not ~”. |
| Te-form | 詳しくて kuwashikute | — | Links to the next clause: “~ and …”. |
| Adverb | 詳しく kuwashiku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 詳しい〜 kuwashii〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 詳しければ kuwashikereba | — | “if it is ~”. |
| Conditional (~たら) | 詳しかったら kuwashikattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 詳しくなる kuwashikunaru | 詳しくなります kuwashikunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 詳しすぎる kuwashisugiru | 詳しすぎます kuwashisugimasu | “too ~”. |
| Looks ~ (~そう) | 詳しそう kuwashisou | 詳しそうです kuwashisoudesu | “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.