Frequency: The word is one of the 3000 most common words in English.
1.
A person or animal that is intelligent has the ability to think, understand, and learn things quickly and well.
Susan's a very bright and intelligent woman who knows her own mind.
ADJ
• intelligently
They are incapable of thinking intelligently about politics.
ADV: ADV with v, ADV adj
2.
Something that is intelligent has the ability to think and understand instead of doing things automatically or by instinct.
An intelligent computer will be an indispensable diagnostic tool for doctors.
ADJ