The Collaborative International Dictionary of English v.0.48:
Unclothed \Un*clothed"\, a.
1. [Properly p. p. of unclothe.] Divested or stripped of
2. [Pref. un- not + clothed.] Not yet clothed; wanting
[1913 Webster] -- Un*cloth"ed*ly, adv. [Obs.] --Bacon.
WordNet (r) 3.0 (2006):
adj 1: not wearing clothing [ant: clad, clothed]
Moby Thesaurus II by Grady Ward, 1.0:
26 Moby Thesaurus words for "unclothed":
clothesless, decollete, disrobed, en deshabille, garbless,
garmentless, half-clothed, in dishabille, low-cut, naked, nude,
nudish, raimentless, raw, stark-naked, strapless, stripped,
topless, unattired, uncased, unclad, undraped, undressed, ungarbed,