in love vs infatuated

in love and infatuated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
in love	No	Yes	No	No
infatuated	No	Yes	No	No

As adjectives, in love and infatuated are synonyms defined as:

Other synonyms of in love include enamored, potty, smitten, soft on, taken with.

in love (adjective)	infatuated (adjective)
marked by foolish or unreasoning fondness	marked by foolish or unreasoning fondness