ややこしい (yayakoshii) conjugation
puzzling, tangled, complicated, complex
ややこしい (ややこしい, yayakoshii) is an i-adjective. I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | ややこしい yayakoshii | ややこしいです yayakoshiidesu | The form you look up. Also the casual “is ~”. |
| Negative | ややこしくない yayakoshikunai | ややこしくないです yayakoshikunaidesu | “is not ~”. |
| Past | ややこしかった yayakoshikatta | ややこしかったです yayakoshikattadesu | “was ~”. |
| Past negative | ややこしくなかった yayakoshikunakatta | ややこしくなかったです yayakoshikunakattadesu | “was not ~”. |
| Te-form | ややこしくて yayakoshikute | — | Links to the next clause: “~ and …”. |
| Adverb | ややこしく yayakoshiku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | ややこしい〜 yayakoshii〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | ややこしければ yayakoshikereba | — | “if it is ~”. |
| Conditional (~たら) | ややこしかったら yayakoshikattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | ややこしくなる yayakoshikunaru | ややこしくなります yayakoshikunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | ややこしすぎる yayakoshisugiru | ややこしすぎます yayakoshisugimasu | “too ~”. |
| Looks ~ (~そう) | ややこしそう yayakoshisou | ややこしそうです yayakoshisoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
See the full rules in the adjective conjugation guide.