Pāli Dictionary
general
pungent, bitter, acrid (of taste); (as noun) pungency, bitterness, a bitter thing
mind
severe, sharp, painful, acute (of pain, feeling, or suffering); distressing
Thag 2.13
atha pāpāni kammāni, karaṃ bālo na bujjhati, pacch'āssa kaṭukaṃ hoti, vipāko hi'ssa pāpako'ti.
AN 4.157
uppannānaṃ sārīrikānaṃ vedanānaṃ dukkhānaṃ tibbānaṃ kharānaṃ kaṭukānaṃ asātānaṃ amanāpānaṃ pāṇaharānaṃ adhivāsakajātikā bhavissāmā'ti
ethics
harsh, caustic, bitter (of words or speech); distressing, bringing bitter consequences (of actions or results)
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