The Collaborative International Dictionary of English v.0.48:
Unadvised \Un`ad*vised"\, a. 1. Not prudent; not discreet; ill advised. --Shak. [1913 Webster] 2. Done without due consideration; wanton; rash; inconsiderate; as, an unadvised proceeding. [1913 Webster] -- Un`ad*vis"ed*ly, adv. -- Un`ad*vis"ed*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
unadvisedly adv 1: in an unadvised manner