The Collaborative International Dictionary of English v.0.48:

Vaguely \Vague"ly\, adv.
   In a vague manner.
   [1913 Webster]

         What he vaguely hinted at, but dared not speak.
                                                  --Hawthorne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vaguely
    adv 1: in a vague way; "he looked vaguely familiar"; "he
           explained it somewhat mistily" [syn: vaguely,
           mistily]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "vaguely":
   absently, aimlessly, ambiguously, anarchically, broadly,
   chaotically, confusedly, confusingly, detachedly, dimly,
   dispersedly, distantly, distractedly, dreamily, generally, idly,
   illegibly, indecisively, indefinably, indefinitely, indeterminably,
   indeterminately, indistinctly, inexactly, inexplicably, nebulously,
   obscurely, planlessly, remotely, riotously, senselessly,
   subconsciously, turbulently, unclearly, vacantly, wanderingly