kopa : [m.] anger; ill-temper.

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

Kopa [fr. kup] ill -- temper, anger, grudge Vin ii.184=Sn 6; Dhs 1060; with appaccaya (mistrust) M i.27; almost exclusively in phrase kopañ ca dosañ ca appaccayañ ca pātukaroti (pātvakāsi) "he shows forth ill -- temper, malice and mistrust" (of a "codita" bhikkhu) D iii.159; S iv.305; M i.96 sq., 250, 442; A i.124, 187; ii.203; iii.181 sq.; iv.168, 193; J i.301; Sn p. 92. <-> akopa (adj.) friendly, without hatred, composed Sn 499.
   -- antara (adj.) one who is under the power of ill-temper S i.24.

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