unfrequented vs solitary

unfrequented is not a noun while solitary is a noun.

Word	Noun	Adjective	Verb	Adverb
unfrequented	No	Yes	No	No
solitary	Yes	Yes	No	No

As adjectives, unfrequented and solitary are synonyms defined as:

Other synonyms of unfrequented include lonely.

unfrequented (noun)	solitary (noun)
	one who lives in solitude
	confinement of a prisoner in isolation from other prisoners

unfrequented (adjective)	solitary (adjective)
devoid of creatures	being the only one; single and isolated from others
	lacking companions or companionship
	of plants and animals; not growing or living in groups or colonies
	devoid of creatures
	characterized by or preferring solitude