The Collaborative International Dictionary of English v.0.48:

Unladylike \Unladylike\
   See ladylike.

WordNet (r) 3.0 (2006):

unladylike
    adj 1: lacking the behavior or manner or style considered proper
           for a lady

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "unladylike":
   boorish, caddish, coarse, crude, ill-bred, inconsiderate,
   insensitive, loutish, louty, nasty, offensive, tactless,
   unfeminine, ungenteel, ungentle, ungentlemanly, unrefined,
   unsolicitous, vulgar