粗い (arai) conjugation
coarse, rough
粗い (あらい, arai) 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 | 粗い arai | 粗いです araidesu | The form you look up. Also the casual “is ~”. |
| Negative | 粗くない arakunai | 粗くないです arakunaidesu | “is not ~”. |
| Past | 粗かった arakatta | 粗かったです arakattadesu | “was ~”. |
| Past negative | 粗くなかった arakunakatta | 粗くなかったです arakunakattadesu | “was not ~”. |
| Te-form | 粗くて arakute | — | Links to the next clause: “~ and …”. |
| Adverb | 粗く araku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 粗い〜 arai〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 粗ければ arakereba | — | “if it is ~”. |
| Conditional (~たら) | 粗かったら arakattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 粗くなる arakunaru | 粗くなります arakunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 粗すぎる arasugiru | 粗すぎます arasugimasu | “too ~”. |
| Looks ~ (~そう) | 粗そう arasou | 粗そうです arasoudesu | “looks / seems ~” from appearance. |
🔊 Tap any Japanese word to hear it spoken.
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.