軽率 (keisotsu) conjugation
thoughtless, careless, hasty
軽率 (けいそつ, keisotsu) 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 | 軽率だ keisotsuda | 軽率です keisotsudesu | The form you look up. Also the casual “is ~”. |
| Negative | 軽率じゃない keisotsujanai | 軽率じゃないです keisotsujanaidesu | “is not ~”. |
| Past | 軽率だった keisotsudatta | 軽率でした keisotsudeshita | “was ~”. |
| Past negative | 軽率じゃなかった keisotsujanakatta | 軽率じゃなかったです keisotsujanakattadesu | “was not ~”. |
| Te-form | 軽率で keisotsude | — | Links to the next clause: “~ and …”. |
| Adverb | 軽率に keisotsuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 軽率な〜 keisotsuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 軽率なら keisotsunara | — | “if it is ~”. |
| Conditional (~たら) | 軽率だったら keisotsudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 軽率になる keisotsuninaru | 軽率になります keisotsuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 軽率すぎる keisotsusugiru | 軽率すぎます keisotsusugimasu | “too ~”. |
| Looks ~ (~そう) | 軽率そう keisotsusou | 軽率そうです keisotsusoudesu | “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.