愚か (oroka) conjugation
foolish, stupid
愚か (おろか, oroka) 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 | 愚かだ orokada | 愚かです orokadesu | The form you look up. Also the casual “is ~”. |
| Negative | 愚かじゃない orokajanai | 愚かじゃないです orokajanaidesu | “is not ~”. |
| Past | 愚かだった orokadatta | 愚かでした orokadeshita | “was ~”. |
| Past negative | 愚かじゃなかった orokajanakatta | 愚かじゃなかったです orokajanakattadesu | “was not ~”. |
| Te-form | 愚かで orokade | — | Links to the next clause: “~ and …”. |
| Adverb | 愚かに orokani | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 愚かな〜 orokana〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 愚かなら orokanara | — | “if it is ~”. |
| Conditional (~たら) | 愚かだったら orokadattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 愚かになる orokaninaru | 愚かになります orokaninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 愚かすぎる orokasugiru | 愚かすぎます orokasugimasu | “too ~”. |
| Looks ~ (~そう) | 愚かそう orokasou | 愚かそうです orokasoudesu | “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.