Etymology
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undressed (adj.)

"naked (or nearly so)," 1610s, past-participle adjective from undress (v.).

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Definitions of undressed

undressed (adj.)
of lumber or stone or hides; not finished or dressed;
undressed granite
undressed hides
undressed (adj.)
having removed clothing;
Synonyms: unappareled / unattired / unclad / ungarbed / ungarmented
From wordnet.princeton.edu