forsake vs desolate

forsake is not an adjective while desolate is an adjective.

Word	Noun	Adjective	Verb	Adverb
forsake	No	No	Yes	No
desolate	No	Yes	Yes	No

As verbs, forsake and desolate are synonyms defined as:

forsake and desolate: leave someone who needs or counts on you; leave in the lurch

Other synonyms of forsake include abandon, desert.

forsake (adjective)	desolate (adjective)
	crushed by grief
	providing no shelter or sustenance

forsake (verb)	desolate (verb)
leave someone who needs or counts on you; leave in the lurch	reduce in population
	cause extensive destruction or ruin utterly
	leave someone who needs or counts on you; leave in the lurch