unenthusiastic vs passionless

unenthusiastic and passionless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unenthusiastic	No	Yes	No	No
passionless	No	Yes	No	No

unenthusiastic (adjective)	passionless (adjective)
not enthusiastic; lacking excitement or ardor	not passionate
	unmoved by feeling