危ない (abunai) conjugation
dangerous, critical
危ない (あぶない, abunai) 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 | 危ない abunai | 危ないです abunaidesu | The form you look up. Also the casual “is ~”. |
| Negative | 危なくない abunakunai | 危なくないです abunakunaidesu | “is not ~”. |
| Past | 危なかった abunakatta | 危なかったです abunakattadesu | “was ~”. |
| Past negative | 危なくなかった abunakunakatta | 危なくなかったです abunakunakattadesu | “was not ~”. |
| Te-form | 危なくて abunakute | — | Links to the next clause: “~ and …”. |
| Adverb | 危なく abunaku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 危ない〜 abunai〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 危なければ abunakereba | — | “if it is ~”. |
| Conditional (~たら) | 危なかったら abunakattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 危なくなる abunakunaru | 危なくなります abunakunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 危なすぎる abunasugiru | 危なすぎます abunasugimasu | “too ~”. |
| Looks ~ (~そう) | 危なそう abunasou | 危なそうです abunasoudesu | “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.