貴重 (kichou) conjugation
precious, valuable
貴重 (きちょう, kichou) 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 | 貴重だ kichouda | 貴重です kichoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 貴重じゃない kichoujanai | 貴重じゃないです kichoujanaidesu | “is not ~”. |
| Past | 貴重だった kichoudatta | 貴重でした kichoudeshita | “was ~”. |
| Past negative | 貴重じゃなかった kichoujanakatta | 貴重じゃなかったです kichoujanakattadesu | “was not ~”. |
| Te-form | 貴重で kichoude | — | Links to the next clause: “~ and …”. |
| Adverb | 貴重に kichouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 貴重な〜 kichouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 貴重なら kichounara | — | “if it is ~”. |
| Conditional (~たら) | 貴重だったら kichoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 貴重になる kichouninaru | 貴重になります kichouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 貴重すぎる kichousugiru | 貴重すぎます kichousugimasu | “too ~”. |
| Looks ~ (~そう) | 貴重そう kichousou | 貴重そうです kichousoudesu | “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.