The Collaborative International Dictionary of English v.0.48:
Improperly \Im*prop"er*ly\, adv. In an improper manner; not properly; unsuitably; unbecomingly. [1913 Webster]WordNet (r) 3.0 (2006):
improperly adv 1: in an improper way; "he checked whether the wound had healed improperly" [ant: decent, decently, in good order, properly, right, the right way]