無理 (muri) conjugation
unreasonable, impossible
無理 (むり, muri) 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 | 無理だ murida | 無理です muridesu | The form you look up. Also the casual “is ~”. |
| Negative | 無理じゃない murijanai | 無理じゃないです murijanaidesu | “is not ~”. |
| Past | 無理だった muridatta | 無理でした murideshita | “was ~”. |
| Past negative | 無理じゃなかった murijanakatta | 無理じゃなかったです murijanakattadesu | “was not ~”. |
| Te-form | 無理で muride | — | Links to the next clause: “~ and …”. |
| Adverb | 無理に murini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 無理な〜 murina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 無理なら murinara | — | “if it is ~”. |
| Conditional (~たら) | 無理だったら muridattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 無理になる murininaru | 無理になります murininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 無理すぎる murisugiru | 無理すぎます murisugimasu | “too ~”. |
| Looks ~ (~そう) | 無理そう murisou | 無理そうです murisoudesu | “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.