1
: unusually fitted or qualified : ready
proved an apt tool in the hands of the conspirators
2
3
: suited to a purpose
especially
: being to the point
an apt quotation
4
: keenly intelligent and responsive
an apt pupil
Both liable and apt when followed by an infinitive are used nearly interchangeably with likely. Although conflicting advice has been given over the years, most current commentators accept apt when so used. They generally recommend limiting liable to situations having an undesirable outcome, and our evidence shows that in edited writing it is more often so used than not.
1
apartment
2
aptitude
apt·ness
ˈap(t)-nəs
plural -es
: the quality or state of being apt:
a
: fitness, suitableness
the universal aptness of a religious system—
A. W. Kinglake
b
: habitual tendency or inclination : likelihood
the aptness of iron to rust
: propensity, proneness
the aptness of criminals to lie
c
: an appropriate quality : appropriateness, appositeness
this last metaphor has a peculiar aptness—
F. R. Leavis
d
: mental alertness : quick-wittedness, aptitude
his aptness in illustration was as charming as it was effective—
Broadus Mitchell
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Merriam-Webster unabridged



