厄介 (yakkai) conjugation
trouble, burden, care
厄介 (やっかい, yakkai) 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 | 厄介だ yakkaida | 厄介です yakkaidesu | The form you look up. Also the casual “is ~”. |
| Negative | 厄介じゃない yakkaijanai | 厄介じゃないです yakkaijanaidesu | “is not ~”. |
| Past | 厄介だった yakkaidatta | 厄介でした yakkaideshita | “was ~”. |
| Past negative | 厄介じゃなかった yakkaijanakatta | 厄介じゃなかったです yakkaijanakattadesu | “was not ~”. |
| Te-form | 厄介で yakkaide | — | Links to the next clause: “~ and …”. |
| Adverb | 厄介に yakkaini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 厄介な〜 yakkaina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 厄介なら yakkainara | — | “if it is ~”. |
| Conditional (~たら) | 厄介だったら yakkaidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 厄介になる yakkaininaru | 厄介になります yakkaininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 厄介すぎる yakkaisugiru | 厄介すぎます yakkaisugimasu | “too ~”. |
| Looks ~ (~そう) | 厄介そう yakkaisou | 厄介そうです yakkaisoudesu | “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.