Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
level-headed is an adjective meaning "exercising or showing good judgment". It carries one recorded sense.
exercising or showing good judgment
“healthy scepticism”
“a healthy fear of rattlesnakes”
“the healthy attitude of French laws”
“healthy relations between labor and management”
“an intelligent solution”
“a sound approach to the problem”
“sound advice”
“no sound explanation for his decision”
Definitions, synonyms and semantic relations for level-headed come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.