The Collaborative International Dictionary of English v.0.48:

Unconcealed \Unconcealed\
   See concealed.

WordNet (r) 3.0 (2006):

unconcealed
    adj 1: not concealed or hidden; "her unconcealed hostility
           poisoned the atmosphere"; "watched with unconcealed
           curiosity" [ant: concealed]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "unconcealed":
   apparent, beholdable, candid, detectable, discernible, disclosed,
   evident, exposed, exposed to view, hanging out, in evidence,
   in full view, in plain sight, in view, insight, manifest, naked,
   noticeable, observable, open, open to view, openhearted,
   outcropping, perceivable, perceptible, plain, recognizable,
   revealed, seeable, showing, straightforward, to be seen,
   uncamouflaged, unclouded, uncurtained, undarkened, undisguised,
   undissembled, undissembling, unhidden, unobscure, unobscured,
   unscreened, unshaded, unvarnished, veilless, viewable, visible,
   visual, witnessable