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" - level headed
possessing sound knowledge "well-informed readers" - well informed
having the capacity for thought and reason especially to a high degree "is there intelligent life in the universe?" "an intelligent question"