vippaṭisāra : [m.] remorse; repentance.

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

Vippaṭisāra [vi+paṭisāra] bad conscience, remorse, regret, repentance Vin ii.250; D i.138; S iii.120, 125; iv.46; A iii.166, 197, 353; iv.69; J iv.12; v.88; Pug 62; DhA iv.42; VvA 116; PvA 14, 60, 105, 152. -- a˚ no regret, no remorse A iii.46.

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