apt
adjective(apt)
being of striking appropriateness and pertinence
Examples:
An apt reply.
apt
adjective(apt)
(usually followed by `to') naturally disposed toward
Examples:
He is apt to ignore matters he considers unimportant.
apt
adjective(apt)
mentally quick and resourceful
Examples:
An apt pupil.
apt
adjective(apt)
at risk of or subject to experiencing something usually unpleasant
Examples:
He is apt to lose.