暑い (atsui) conjugation
hot (in reference to weather), warm
暑い (あつい, atsui) 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 | 暑い atsui | 暑いです atsuidesu | The form you look up. Also the casual “is ~”. |
| Negative | 暑くない atsukunai | 暑くないです atsukunaidesu | “is not ~”. |
| Past | 暑かった atsukatta | 暑かったです atsukattadesu | “was ~”. |
| Past negative | 暑くなかった atsukunakatta | 暑くなかったです atsukunakattadesu | “was not ~”. |
| Te-form | 暑くて atsukute | — | Links to the next clause: “~ and …”. |
| Adverb | 暑く atsuku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 暑い〜 atsui〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 暑ければ atsukereba | — | “if it is ~”. |
| Conditional (~たら) | 暑かったら atsukattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 暑くなる atsukunaru | 暑くなります atsukunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 暑すぎる atsusugiru | 暑すぎます atsusugimasu | “too ~”. |
| Looks ~ (~そう) | 暑そう atsusou | 暑そうです atsusoudesu | “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.