uninvited

from WordNet (r) 3.0 (2006)

uninvited
    adj 1: unwelcome and unwanted; "uninvited guests"; "uninvited
           thoughts"

from The Collaborative International Dictionary of English v.0.48

Uninvited \Uninvited\
   See {invited}.

from Moby Thesaurus II by Grady Ward, 1.0

43 Moby Thesaurus words for "uninvited":
      arbitrary, autonomous, discretional, discretionary, elective, free,
      free will, gratuitous, independent, nonmandatory, offered,
      optional, proffered, self-acting, self-active, self-determined,
      self-determining, spontaneous, unacceptable, unagreeable, unasked,
      unasked-for, unbesought, unbidden, uncalled-for, uncoerced,
      uncompelled, undesirable, undesired, unforced, uninfluenced,
      unpressured, unprompted, unrequested, unrequired, unsolicited,
      unsought, unwanted, unwelcome, unwished, voluntary, volunteer,
      willful