快い (kokoroyoi) conjugation
pleasant, agreeable
快い (こころよい, kokoroyoi) 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 | 快い kokoroyoi | 快いです kokoroyoidesu | The form you look up. Also the casual “is ~”. |
| Negative | 快くない kokoroyokunai | 快くないです kokoroyokunaidesu | “is not ~”. |
| Past | 快かった kokoroyokatta | 快かったです kokoroyokattadesu | “was ~”. |
| Past negative | 快くなかった kokoroyokunakatta | 快くなかったです kokoroyokunakattadesu | “was not ~”. |
| Te-form | 快くて kokoroyokute | — | Links to the next clause: “~ and …”. |
| Adverb | 快く kokoroyoku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 快い〜 kokoroyoi〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 快ければ kokoroyokereba | — | “if it is ~”. |
| Conditional (~たら) | 快かったら kokoroyokattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 快くなる kokoroyokunaru | 快くなります kokoroyokunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 快すぎる kokoroyosugiru | 快すぎます kokoroyosugimasu | “too ~”. |
| Looks ~ (~そう) | 快そう kokoroyosou | 快そうです kokoroyosoudesu | “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.