intelligent

having the capacity for thought and reason especially to a high degree; "is there intelligent life in the universe?"; "an intelligent question"

possessing sound knowledge; "well-informed readers"

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"

endowed with the capacity to reason