The Collaborative International Dictionary of English v.0.48:
Unhallowed \Un*hal"lowed\, a. [Pref. un- not + hallowed.] Not consecrated; hence, profane; unholy; impious; wicked. [1913 Webster] In the cause of truth, no unhallowed violence . . . is either necessary or admissible. --E. D. Griffin. [1913 Webster]WordNet (r) 3.0 (2006):
unhallowed adj 1: not hallowed or consecrated [syn: unholy, unhallowed] [ant: holy]