"levelheaded" in the adjective sense
1. healthy, intelligent, levelheaded, level-headed, sound
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"
Source: WordNet® (An amazing lexical database of English)
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