half-hearted vs halfhearted

half-hearted and halfhearted both are adjectives.

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

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

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

Other synonyms of half-hearted include lukewarm, tepid.

half-hearted (adjective)	halfhearted (adjective)
feeling or showing little interest or enthusiasm	feeling or showing little interest or enthusiasm