The Collaborative International Dictionary of English v.0.48:
Unwise \Un*wise"\, a. [AS. unw[imac]s. See Un- not, and Wise, a.] Not wise; defective in wisdom; injudicious; indiscreet; foolish; as, an unwise man; unwise kings; unwise measures. [1913 Webster]WordNet (r) 3.0 (2006):
unwise adj 1: showing or resulting from lack of judgment or wisdom; "an unwise investor is soon impoverished" 2: not appropriate to the purpose [syn: inexpedient, unwise]