تأسف

ta`assuf, vulg. tāssuf[inf. n. v of اسف 'to grieve'], s.m. Grieving, lamenting, pining, brooding over trouble or affliction; grief, regret, repentance (=afsos):—ta`assuf karnā, v.n. To grieve, regret, etc.:—ta`assuf khānā(-se), To feel regret (for), to sigh (over); to despair (of).