The Collaborative International Dictionary of English v.0.48:

Inappropriate \In`ap*pro"pri*ate\, a.
   Not instrument (to); not appropriate; unbecoming; unsuitable;
   not specially fitted; -- followed by to or for. --
   In`ap*pro"pri*ate*ly, adv. -- In`ap*pro"pri*ate*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inappropriately
    adv 1: in an inappropriate manner; "he was inappropriately
           dressed" [syn: inappropriately, unsuitably] [ant:
           appropriately, befittingly, fitly, fittingly,
           suitably]