The Collaborative International Dictionary of English v.0.48:

Uninviting \Uninviting\
   See inviting.

WordNet (r) 3.0 (2006):

uninviting
    adj 1: neither attractive nor tempting [ant: inviting]
    2: not tempting [syn: uninviting, untempting]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "uninviting":
   abhorrent, bitter, disagreeable, dislikable, displeasing,
   distasteful, foul-tasting, ill-flavored, intolerable, mislikable,
   odious, sour, thankless, ugly, unalluring, unappealing,
   unappetizing, unattractive, uncongenial, undelectable, undelicious,
   undesirable, unengaging, unenjoyable, unlikable, unlovable,
   unpalatable, unpleasant, unpleasing, unsavory, untasteful, untasty,
   unwelcome