intelligent in WordNet English dictionary

1. 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"
   healthy  intelligent  levelheaded  level-headed  sound 
   
2. having the capacity for thought and reason especially to a high degree
   "is there intelligent life in the universe?"; "an intelligent question"
   intelligent 
   
3. endowed with the capacity to reason
   intelligent  reasoning  thinking 
   
4. possessing sound knowledge
   "well-informed readers"
   intelligent  well-informed