1.  desirableness(n = noun.attribute) desirability - the quality of being worthy of desiring;
is a kind of good, goodness
Derived form adjective desirable₁

2.  desirableness(n = noun.attribute) desirability, oomph, sex appeal - attractiveness to the opposite sex;
is a kind of attractiveness
has particulars: sultriness
Derived form adjective desirable₂

N  expedience, expediency, desirableness, desirability, fitness, utility, propriety, opportunism, advantage, high time, expedient, desirable, advisable, acceptable, convenient, worth while, meet, fit, fitting, due, proper, eligible, seemly, becoming, befitting, opportune, in loco, suitable, applicable, in the right place, conveniently, operae pretium est.