快適 (kaiteki) conjugation
pleasant, agreeable
快適 (かいてき, kaiteki) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 快適だ kaitekida | 快適です kaitekidesu | The form you look up. Also the casual “is ~”. |
| Negative | 快適じゃない kaitekijanai | 快適じゃないです kaitekijanaidesu | “is not ~”. |
| Past | 快適だった kaitekidatta | 快適でした kaitekideshita | “was ~”. |
| Past negative | 快適じゃなかった kaitekijanakatta | 快適じゃなかったです kaitekijanakattadesu | “was not ~”. |
| Te-form | 快適で kaitekide | — | Links to the next clause: “~ and …”. |
| Adverb | 快適に kaitekini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 快適な〜 kaitekina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 快適なら kaitekinara | — | “if it is ~”. |
| Conditional (~たら) | 快適だったら kaitekidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 快適になる kaitekininaru | 快適になります kaitekininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 快適すぎる kaitekisugiru | 快適すぎます kaitekisugimasu | “too ~”. |
| Looks ~ (~そう) | 快適そう kaitekisou | 快適そうです kaitekisoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.