The Collaborative International Dictionary of English v.0.48:

Unexposed \Unexposed\
   See exposed.

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "unexposed":
   able, enigmatic, incalculable, incognizable, invisible, mysterious,
   puzzling, sealed, strange, unapparent, unapprehended,
   unascertained, unbeknown, uncharted, unclassified, undetected,
   undisclosed, undiscoverable, undiscovered, undivulged, unexplained,
   unexplored, unfamiliar, unfathomed, unheard, unheard-of,
   unidentified, uninvestigated, unknowable, unknown, unperceived,
   unplumbed, unrevealed, unseen, unsolved, unspied, unsuspected,
   untouched, untraced, untracked, virgin