level-headed vs levelheaded

level-headed and levelheaded both are adjectives.

Word	Noun	Adjective	Verb	Adverb
level-headed	No	Yes	No	No
levelheaded	No	Yes	No	No

As adjectives, level-headed and levelheaded are synonyms defined as:

Other synonyms of level-headed include healthy, intelligent, sound.

level-headed (adjective)	levelheaded (adjective)
exercising or showing good judgment	exercising or showing good judgment