Meaning : Having the capacity for thought and reason especially to a high degree.
Example :
Is there intelligent life in the universe?.
An intelligent question.
Meaning : Exercising or showing good judgment.
Example :
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.
Synonyms : healthy, level-headed, levelheaded, sound