台無し (dainashi) conjugation
mess, spoiled, (come to) nothing
台無し (だいなし, dainashi) 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 | 台無しだ dainashida | 台無しです dainashidesu | The form you look up. Also the casual “is ~”. |
| Negative | 台無しじゃない dainashijanai | 台無しじゃないです dainashijanaidesu | “is not ~”. |
| Past | 台無しだった dainashidatta | 台無しでした dainashideshita | “was ~”. |
| Past negative | 台無しじゃなかった dainashijanakatta | 台無しじゃなかったです dainashijanakattadesu | “was not ~”. |
| Te-form | 台無しで dainashide | — | Links to the next clause: “~ and …”. |
| Adverb | 台無しに dainashini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 台無しな〜 dainashina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 台無しなら dainashinara | — | “if it is ~”. |
| Conditional (~たら) | 台無しだったら dainashidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 台無しになる dainashininaru | 台無しになります dainashininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 台無しすぎる dainashisugiru | 台無しすぎます dainashisugimasu | “too ~”. |
| Looks ~ (~そう) | 台無しそう dainashisou | 台無しそうです dainashisoudesu | “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.