kasaṭa : [m.] the refuse; dregs; acrid. (adj.), nasty; worthless.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Kasaṭa (metathesis of sakaṭa, cp. Trenckner, Miln p. 423) 1. (adj.) bad, nasty; bitter, acrid; insipid, disgusting A i.72; J ii.96; 159. -- 2. (m.) (a) fault, vice, defect M i.281; Ps ii.87. -- (b) leavings, dregs VvA 288 (v. l. sakaṭa). -- (c) something bitter or nasty J ii.96; v.18. -- (d) bitter juice J ii.105 (nimba˚). -- sa˚ faulty, wrong, bitter to eat, unpalatable Miln 119.
   -- ôdaka insipid, tasteless water J ii.97.

Pali-English Dictionary, TW Rhys Davids, William Stede,