passionless vs unimpassioned

passionless and unimpassioned both are adjectives.

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

passionless (adjective)	unimpassioned (adjective)
not passionate	free from emotional appeal; marked by reasonableness
unmoved by feeling