The Collaborative International Dictionary of English v.0.48:
unholy \un*ho"ly\ ([u^]n*h[=o]"l[y^]), a. Not holy; unhallowed; not consecrated; hence, profane; wicked; impious. -- un*ho"li*ly, adv. -- un*ho"li*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
unholiness n 1: the quality of being unholy [ant: holiness, sanctitude, sanctity]