half-hearted vs lukewarm

half-hearted and lukewarm both are adjectives.

Word	Noun	Adjective	Verb	Adverb
half-hearted	No	Yes	No	No
lukewarm	No	Yes	No	No

As adjectives, half-hearted and lukewarm are synonyms defined as:

half-hearted and lukewarm: feeling or showing little interest or enthusiasm

Other synonyms of half-hearted include halfhearted, tepid.

half-hearted (adjective)	lukewarm (adjective)
feeling or showing little interest or enthusiasm	feeling or showing little interest or enthusiasm
	moderately warm