懈怠

懈怠

1. slack; sluggish; remiss; lax

   紀律懈怠。／纪律懈怠。  ―  Jìlǜ xièdài.  ―  Discipline is lax.

From Middle Chinese compound 懈怠 (hɛ^X doi^X, literally “idle + negligent”). The kan'on, so likely a later borrowing.

• (Tokyo) かいたい [kàítáí] (Heiban – [0])^[1]
• IPA^(key): [ka̠ita̠i]

懈(かい)怠(たい) • (kaitai) 

1. (law) laches: a kind of lapse wherein an opposing party has neglected to invoke its rights within a certain period of time
2. (civil law) negligence
3. laziness, idleness, carelessness

The Japanese Wikipedia article 懈怠 (法学) describing the legal laches and negligence senses uses the ketai reading. However, dictionaries tend to list kaitai as the primary reading for the legal senses.^[1][2]

• (negligence): 過失(かしつ) (kashitsu)
• (laziness): 怠慢(たいまん) (taiman)

From Middle Chinese compound 懈怠 (hɛ^X doi^X, 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.

• (Tokyo) けたい [kètáí] (Heiban – [0])^[1]
• IPA^(key): [ke̞ta̠i]

懈(け)怠(たい) • (ketai) 

1. laziness, idleness, carelessness
2. (law) laches: a kind of lapse wherein an opposing party has neglected to invoke its rights within a certain period of time
3. (civil law) negligence
4. (Buddhism) spiritual slothfulness: kausidya

The kedai reading below is more common for the Buddhist spiritual slothfulness sense.

• (laziness): 怠慢(たいまん) (taiman)

懈(け)怠(たい)する • (ketai suru) suru (stem 懈(け)怠(たい)し (ketai shi), past 懈(け)怠(たい)した (ketai shita))

1. to be lazy, to be careless

• (laziness): 怠慢(たいまん) (taiman)

From Middle Chinese compound 懈怠 (hɛ^X doi^X, literally “idle + negligent”). The goon, so likely the original borrowing.

• (Tokyo) けだい [kèdáí] (Heiban – [0])^[1]
• IPA^(key): [ke̞da̠i]

懈(け)怠(だい) • (kedai) 

1. (Buddhism) spiritual slothfulness: kausidya
2. laziness, idleness, carelessness

The ketai reading above is more common for the laziness sense.