level-headed vs intelligent

level-headed and intelligent both are adjectives.

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

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

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

level-headed (adjective)	intelligent (adjective)
exercising or showing good judgment	having the capacity for thought and reason especially to a high degree
	endowed with the capacity to reason
	exercising or showing good judgment
	possessing sound knowledge