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