inclined; disposed; given; prone

too apt to slander others.

likely

Am I apt to find him at home?

unusually intelligent; able to learn quickly and easily

an apt pupil.

suited to the purpose or occasion; appropriate

an apt metaphor; a few apt remarks on world peace.

Archaic . prepared; ready; willing.

noun

aptitude , bent , faculty , flair , genius , gift , head , instinct , knack , turn