Synonyms for Stark naked:

adj.

naked (adjective)
in the raw, in the buff.
starkers (adjective)
naked as a jaybird, raw, peeled, in the altogether, unclothed.

n.

nude (noun)
without a stitch of clothing.
stark naked (noun)
in the buff, peeled, bare-ass, raw, unclothed, in the altogether, naked as a jaybird, bare-assed, in the raw.