おいしい (oishii) conjugation
delicious, tasty
おいしい (おいしい, oishii) 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.
Written 美味しい in kanji, but usually written in kana alone.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | おいしい oishii | おいしいです oishiidesu | The form you look up. Also the casual “is ~”. |
| Negative | おいしくない oishikunai | おいしくないです oishikunaidesu | “is not ~”. |
| Past | おいしかった oishikatta | おいしかったです oishikattadesu | “was ~”. |
| Past negative | おいしくなかった oishikunakatta | おいしくなかったです oishikunakattadesu | “was not ~”. |
| Te-form | おいしくて oishikute | — | Links to the next clause: “~ and …”. |
| Adverb | おいしく oishiku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | おいしい〜 oishii〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | おいしければ oishikereba | — | “if it is ~”. |
| Conditional (~たら) | おいしかったら oishikattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | おいしくなる oishikunaru | おいしくなります oishikunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | おいしすぎる oishisugiru | おいしすぎます oishisugimasu | “too ~”. |
| Looks ~ (~そう) | おいしそう oishisou | おいしそうです oishisoudesu | “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.