Meaning

adjective not hallowed or consecrated

adjective extremely evil or cruel; expressive of cruelty or befitting hell

adjective having committed unrighteous acts

originFrom Middle English unholi, unhaliȝ, from Old English unhāliġ, from Proto-Germanic *unhailagaz, equivalent to un- + holy. Cognate with Scots unhaly, Dutch onheilig, German Low German unhillig, German unheilig, Danish uhellig, Swedish ohelig.

Etymology from Wiktionary, CC BY-SA 3.0