unsuspected

from WordNet (r) 3.0 (2006)

unsuspected
    adj 1: not suspected or believed likely; "remained unsuspected
           as the head of the spy ring"; "he was able to get into
           the building unspotted and unsuspected"; "unsuspected
           difficulties arose"; "unsuspected turnings in the road"
           [ant: {suspected}]

from The Collaborative International Dictionary of English v.0.48

Unsuspected \Unsuspected\
   See {suspected}.

from Moby Thesaurus II by Grady Ward, 1.0

43 Moby Thesaurus words for "unsuspected":
      able, accepted, believed, credited, enigmatic, incalculable,
      incognizable, mysterious, puzzling, received, sealed, strange,
      trusted, unapparent, unapprehended, unascertained, unbeknown,
      uncharted, unclassified, uncontested, undisclosed, undiscoverable,
      undiscovered, undisputed, undivulged, undoubted, unexplained,
      unexplored, unexposed, unfamiliar, unfathomed, unheard, unheard-of,
      unidentified, uninvestigated, unknowable, unknown, unperceived,
      unplumbed, unquestioned, unrevealed, untouched, virgin