efficacity

noun 0.860

efficaciousness

noun 0.833

effectiveness

noun 0.773

effectuality

noun 0.756

bioefficacy

noun 0.744

inefficacy

noun 0.723

effectivity

noun 0.722

efficiency

noun 0.707

effective

noun 0.620

efficient cause

noun 0.605

potency

noun 0.598

ineffectiveness

noun 0.582

competency

noun 0.562

competence

noun 0.557

proficiency

noun 0.546

validity

noun 0.545

ability

noun 0.537

usefulness

noun 0.534

effeteness

noun 0.532

productive efficiency

noun 0.532

static efficiency

noun 0.532

effect

noun 0.530

productivity

noun 0.530

powerfulness

noun 0.527

inefficiency

noun 0.522

eloquence

noun 0.519

usability

noun 0.516

desired effect

noun 0.516

productiveness

noun 0.515

functionality

noun 0.515

effective energy

noun 0.514

persuasiveness

noun 0.511

statistical power

noun 0.511

enforceability

noun 0.510

credibility

noun 0.507

placebo effect

noun 0.506

veracity

noun 0.505

empowerment

noun 0.505

curability

noun 0.503

adequacy

noun 0.503

impotency

noun 0.503

sufficiency

noun 0.501

reliability

noun 0.500