怪しい (ayashii) conjugation
suspicious, dubious, doubtful
怪しい (あやしい, ayashii) 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 | 怪しい ayashii | 怪しいです ayashiidesu | The form you look up. Also the casual “is ~”. |
| Negative | 怪しくない ayashikunai | 怪しくないです ayashikunaidesu | “is not ~”. |
| Past | 怪しかった ayashikatta | 怪しかったです ayashikattadesu | “was ~”. |
| Past negative | 怪しくなかった ayashikunakatta | 怪しくなかったです ayashikunakattadesu | “was not ~”. |
| Te-form | 怪しくて ayashikute | — | Links to the next clause: “~ and …”. |
| Adverb | 怪しく ayashiku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 怪しい〜 ayashii〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 怪しければ ayashikereba | — | “if it is ~”. |
| Conditional (~たら) | 怪しかったら ayashikattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 怪しくなる ayashikunaru | 怪しくなります ayashikunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 怪しすぎる ayashisugiru | 怪しすぎます ayashisugimasu | “too ~”. |
| Looks ~ (~そう) | 怪しそう ayashisou | 怪しそうです ayashisoudesu | “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.