Wordnet 3.0
ADJECTIVE (1)
1. 
 not suspected or believed likely; 
- Example: "remained unsuspected as the head of the spy ring"- Example: "he was able to get into the building unspotted and unsuspected"- Example: "unsuspected difficulties arose"- Example: "unsuspected turnings in the road"
The Collaborative International Dictionary of English v.0.48:
Unsuspected \Unsuspected\
   See suspected.
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]
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