鈍感 (donkan) conjugation
thickheadedness, stolidity
鈍感 (どんかん, donkan) 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 | 鈍感だ donkanda | 鈍感です donkandesu | The form you look up. Also the casual “is ~”. |
| Negative | 鈍感じゃない donkanjanai | 鈍感じゃないです donkanjanaidesu | “is not ~”. |
| Past | 鈍感だった donkandatta | 鈍感でした donkandeshita | “was ~”. |
| Past negative | 鈍感じゃなかった donkanjanakatta | 鈍感じゃなかったです donkanjanakattadesu | “was not ~”. |
| Te-form | 鈍感で donkande | — | Links to the next clause: “~ and …”. |
| Adverb | 鈍感に donkanni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 鈍感な〜 donkanna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 鈍感なら donkannara | — | “if it is ~”. |
| Conditional (~たら) | 鈍感だったら donkandattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 鈍感になる donkanninaru | 鈍感になります donkanninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 鈍感すぎる donkansugiru | 鈍感すぎます donkansugimasu | “too ~”. |
| Looks ~ (~そう) | 鈍感そう donkansou | 鈍感そうです donkansoudesu | “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.