Etymology 1
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From Middle Chinese compound 懈怠 (hɛX doiX, literally “idle + negligent”). The kan'on, so likely a later borrowing.
Etymology 2
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From Middle Chinese compound 懈怠 (hɛX doiX, literally “idle + negligent”). A mixed reading, so likely a later development within Japanese. Uses the goon of ke for the first half, and the kan'on of tai for the second half.
Verb
懈怠する • (ketai suru) suru (stem 懈怠し (ketai shi), past 懈怠した (ketai shita))
- to be lazy, to be careless
Conjugation
More information Katsuyōkei ("stem forms"), Mizenkei ("imperfective") ...
Katsuyōkei ("stem forms") |
Mizenkei ("imperfective") |
懈怠し |
けたいし |
ketai shi |
Ren’yōkei ("continuative") |
懈怠し |
けたいし |
ketai shi |
Shūshikei ("terminal") |
懈怠する |
けたいする |
ketai suru |
Rentaikei ("attributive") |
懈怠する |
けたいする |
ketai suru |
Kateikei ("hypothetical") |
懈怠すれ |
けたいすれ |
ketai sure |
Meireikei ("imperative") |
懈怠せよ¹ 懈怠しろ² |
けたいせよ¹ けたいしろ² |
ketai seyo¹ ketai shiro² |
Key constructions |
Passive |
懈怠される |
けたいされる |
ketai sareru |
Causative |
懈怠させる 懈怠さす |
けたいさせる けたいさす |
ketai saseru ketai sasu |
Potential |
懈怠できる |
けたいできる |
ketai dekiru |
Volitional |
懈怠しよう |
けたいしよう |
ketai shiyō |
Negative |
懈怠しない |
けたいしない |
ketai shinai |
Negative continuative |
懈怠せず |
けたいせず |
ketai sezu |
Formal |
懈怠します |
けたいします |
ketai shimasu |
Perfective |
懈怠した |
けたいした |
ketai shita |
Conjunctive |
懈怠して |
けたいして |
ketai shite |
Hypothetical conditional |
懈怠すれば |
けたいすれば |
ketai sureba |
¹ Written imperative
² Spoken imperative |
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Etymology 3
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From Middle Chinese compound 懈怠 (hɛX doiX, literally “idle + negligent”). The goon, so likely the original borrowing.