inefficaciousness, inefficacy

efficacy, unobtrusiveness, practicality, discreetness, simplicity, skillfulness, robustness, unusualness, comfortableness, changeability, cleanness, transitivity, adaptiveness, aesthetics, easiness, naturalness, safeness, purity, impermeability, indestructibility, chronological age, antitumour, esthetical, wearability, essentialness, practicability, usability, amicability, equipoise, reproducibility, communicability, tractability, conspicuousness, wholeheartedness, durability, percept, unpretentiousness, comprehensibility, effectiveness, handiness, roadholding, quietness, restfulness, pointedness, humaneness, harmlessness, warmheartedness, perfectness, publicness, exceptionality, edibility, toxicity, compartmentalisation, sturdiness, preciseness, rareness, aesthetical, imaginativeness, lightness, mutability, provocativeness, smoothness, noetic, incurability, inheritability, stereovision, thoroughness, heftiness, radiopacity, briefness, ruggedness, irrepressibility, comeliness, unnaturalness, esthetic, slimness, liveness, solubility, unconventionality, trueness, conspicuity, limitlessness, plushness, agelessness, stolidity, intolerability, sweatiness, reversibility, dutifulness, assortative mating, xenobiotic, wilfulness, stylishness, agreeability, ratiocination, cogency, inefficacy, thermoregulation, perspicuity, speediness, bioavailability, refinement, empathy, rapport, accomplishment, actualization, adaptability, applicability, attentiveness, continuity, embeddedness, immediacy, individuality, interrelatedness, inviolability, potency, synergy, uniqueness, unity, accomplishments

effectivity, effectuality, effectualness