いい加減 (iikagen) conjugation
random, irresponsible
いい加減 (いいかげん, iikagen) 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 | いい加減だ iikagenda | いい加減です iikagendesu | The form you look up. Also the casual “is ~”. |
| Negative | いい加減じゃない iikagenjanai | いい加減じゃないです iikagenjanaidesu | “is not ~”. |
| Past | いい加減だった iikagendatta | いい加減でした iikagendeshita | “was ~”. |
| Past negative | いい加減じゃなかった iikagenjanakatta | いい加減じゃなかったです iikagenjanakattadesu | “was not ~”. |
| Te-form | いい加減で iikagende | — | Links to the next clause: “~ and …”. |
| Adverb | いい加減に iikagenni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | いい加減な〜 iikagenna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | いい加減なら iikagennara | — | “if it is ~”. |
| Conditional (~たら) | いい加減だったら iikagendattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | いい加減になる iikagenninaru | いい加減になります iikagenninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | いい加減すぎる iikagensugiru | いい加減すぎます iikagensugimasu | “too ~”. |
| Looks ~ (~そう) | いい加減そう iikagensou | いい加減そうです iikagensoudesu | “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.