unattired vs undressed

unattired and undressed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unattired	No	Yes	No	No
undressed	No	Yes	No	No

As adjectives, unattired and undressed are synonyms defined as:

Other synonyms of unattired include unappareled, unclad, ungarbed, ungarmented.

unattired (adjective)	undressed (adjective)
having removed clothing	having removed clothing
	of lumber or stone or hides; not finished or dressed