If someone is apt to do something, they often do it and so it is likely that they will do it again. She was apt to raise her voice and wave her hands about = liable. apartment
An apt remark, description, or choice is especially suitable. The words of this report are as apt today as in 1929. an apt description of the situation. + aptly apt·ly the beach in the aptly named town of Oceanside
Having a habitual tendency; habitually liable or likely; disposed towards-used of persons or things