Proto-IE: *k'onk-
Meaning: to doubt
Old Indian: śáṅkate `to be anxious, afraid, fear, dread, distrust', ptc. śaṅkita-, śaṅkā́ f. `apprehension, care, alarm, fear, distrust, suspicion, doubt'
Latin: cūnctārī (OLat cūnctāre) `zaudern, zögern, unschlüssig sein'
Russ. meaning: сомневаться