先天的 (sententeki) conjugation
inherent, congenital, hereditary
先天的 (せんてんてき, sententeki) 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 | 先天的だ sententekida | 先天的です sententekidesu | The form you look up. Also the casual “is ~”. |
| Negative | 先天的じゃない sententekijanai | 先天的じゃないです sententekijanaidesu | “is not ~”. |
| Past | 先天的だった sententekidatta | 先天的でした sententekideshita | “was ~”. |
| Past negative | 先天的じゃなかった sententekijanakatta | 先天的じゃなかったです sententekijanakattadesu | “was not ~”. |
| Te-form | 先天的で sententekide | — | Links to the next clause: “~ and …”. |
| Adverb | 先天的に sententekini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 先天的な〜 sententekina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 先天的なら sententekinara | — | “if it is ~”. |
| Conditional (~たら) | 先天的だったら sententekidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 先天的になる sententekininaru | 先天的になります sententekininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 先天的すぎる sententekisugiru | 先天的すぎます sententekisugimasu | “too ~”. |
| Looks ~ (~そう) | 先天的そう sententekisou | 先天的そうです sententekisoudesu | “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.