efficacity

noun 0.836

efficacy

noun 0.833

effectuality

noun 0.797

effectivity

noun 0.751

effectiveness

noun 0.729

bioefficacy

noun 0.682

effective

noun 0.650

inefficacy

noun 0.642

ineffectiveness

noun 0.600

efficient cause

noun 0.588

efficiency

noun 0.561

effeteness

noun 0.561

forcefulness

noun 0.530

usefulness

noun 0.528

expeditiousness

noun 0.527

convincingness

noun 0.522

actionability

noun 0.517

advantageousness

noun 0.516

enforceability

noun 0.516

potency

noun 0.514

noneffective

noun 0.514

desired effect

noun 0.511

evidentness

noun 0.510

ill effect

noun 0.506

purposefulness

noun 0.502