Words and phrases that have a meaning related to effectiveness:  (170 results)
Often used in the same context:
efficacy, usefulness, potency, relevance, interpretability, efficiency, appropriateness, applicability, responsiveness, ability, acceptability, viability, validity, adherence, productiveness, robustness, effi, relevancy, accuracy, ineffectiveness, credibility, durability, representativeness, practicability, trustworthiness, marketability, worthiness, palatability, receptivity, legitimacy, reliability, healthfulness, persuasiveness, measurability, merits, legality, enforceability, deadliness, defensibility, productivity, competence, susceptibility, desirability, lethality, severity, timeliness, harmfulness, consistency, bioavailability, soundness, efficaciousness, adaptability, antigenicity, readiness, thoroughness, rigorousness, reproducibility, successfulness, practicality, outcomes, rigor, antitumour, intolerability, capability, safeness, communicability, suitability, usability, feasibility, impact, uptake, curability, longevity, conspicuity, cytotoxicity, reboxetine, competitiveness, innovativeness, quality, dependability, clomipramine, fatigability, veracity, seriousness, comprehensiveness, effects, compliance, understandability, intrusiveness, advisability, helpfulness, pervasiveness, rightfulness, chronological age, strength, superiority, importance, authenticity, pimozide, transparency, radiopacity, success, utility, attractiveness, flexibility, predictability, epidemiologic, epidemiological, kinematic, neurophysiologic, psychometric, sociopsychological, aggregative, allometric, anthropometric, benefit, biophysical, correlational, demographic, electrophysiological, ergonomic, idiographic, microeconomic, neurobiological, neurochemical, neurophysiological
More specific:
incisiveness, trenchancy
More general:
power, powerfulness
Also try:
— Adjectives for effectiveness: cost, relative, organizational, overall, greater, maximum, clinical, therapeutic, potential, military, term, more...

Commonly used words are shown in bold. Rare words are dimmed.
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