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