intelligent vs level-headed

intelligent and level-headed both are adjectives.

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

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

Other synonyms of intelligent include healthy, levelheaded, sound.

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