Synonyms for Efficacy:

• n.

  •
  • value,
  • user-friendliness,
  • practicality,
  • worth.
  •
  • affect,
  • influence.
  •capability (noun)
  • craft,
  • means,
  • potential,
  • art,
  • cunning,
  • faculty,
  • qualification,
  • wherewithal,
  • skill,
  • potentiality,
  • aptitude,
  • proficiency.
  •effect (noun)
  • enforcement,
  • fact,
  • execution,
  • sense,
  • reality,
  • drift,
  • tenor,
  • action,
  • efficaciousness,
  • essence,
  • significance,
  • purpose,
  • purport,
  • clout,
  • implementation,
  • import,
  • meaning,
  • imprint,
  • mark.
  •effectiveness (noun)
  • verve,
  • cogency,
  • punch,
  • point,
  • productiveness.
  •efficacy (noun)
  • success,
  • sufficiency,
  • adequacy,
  • vigor,
  • virtue,
  • competence,
  • capacity,
  • use.
  •efficiency (noun)
  • competency,
  • thoroughness,
  • abundance,
  • completeness,
  • adaptability,
  • address,
  • talent,
  • economy,
  • quantity,
  • readiness,
  • know-how,
  • suitability,
  • productivity,
  • expertise,
  • response,
  • suitableness,
  • powerfulness.
  •energy (noun)
  • exertion,
  • liveliness,
  • virility,
  • enterprise,
  • peppiness,
  • ardor,
  • zip,
  • puissance,
  • spirit,
  • zest,
  • tuck,
  • application,
  • spontaneity,
  • pep,
  • vivacity,
  • hardihood,
  • life,
  • fortitude,
  • vehemence,
  • pluck,
  • élan,
  • initiative,
  • sprightliness,
  • go,
  • pizzazz,
  • vitality,
  • muscle,
  • juice,
  • get-up-and-go,
  • vim,
  • endurance,
  • activity,
  • drive,
  • operativeness,
  • birr,
  • zing,
  • zeal,
  • steam,
  • fire,
  • intensity,
  • dash,
  • toughness,
  • animation,
  • stamina.
  •force (noun)
  • dominance,
  • obligation,
  • intestinal fortitude,
  • authority,
  • duress,
  • determination,
  • pressure,
  • emphasis,
  • persuasiveness,
  • stress,
  • gumption,
  • coercion,
  • willpower,
  • sapience,
  • fierceness,
  • push.
  •get-up-and-go (noun)
  • get up and go,
  • Oes,
  • o.
  •might (noun)
  • control,
  • jurisdiction,
  • vigorousness,
  • command,
  • valor,
  • mastery,
  • arm,
  • sway,
  • domination.
  •performance (noun)
  • exercise,
  • practice,
  • running,
  • functioning,
  • working,
  • pursuit,
  • conduct.
  •potency (noun)
  • snap,
  • zap,
  • dominion,
  • sock.
  •power (noun)
  • dynamism.
  •utility (noun)
  • advantageousness,
  • serviceability.
  •validity (noun)
  • legitimacy.
  •weight (noun)
  • weightinesses.

• Other synonyms:

  •
  • effectuality,
  • synergy,
  • utility,
  • effectualness,
  • usability,
  • usefulness,
  • effectiveness.
  •Other relevant words:
  • calibre,
  • dexterity,
  • impact,
  • apothecaries' weight,
  • realize,
  • fitness,
  • business,
  • subservience,
  • instrumentality,
  • consecrate,
  • utilization,
  • dedicate,
  • continue,
  • availability,
  • ensue,
  • adeptness,
  • Cui bono,
  • flair,
  • mimic,
  • stead,
  • Enablement,
  • Efficacity,
  • caliber,
  • goodness,
  • follow,
  • adhere,
  • apply,
  • applicability,
  • impersonate,
  • accompany,
  • pursue,
  • vigour,
  • Ableness,
  • adroitness,
  • intention,
  • determine,
  • intend,
  • susceptibility,
  • succeed,
  • feign,
  • emulate,
  • comprehend,
  • Potence,
  • expertness,
  • genius,
  • goods,
  • service,
  • catch,
  • experience,
  • practicability,
  • aid,
  • consequence,
  • help,
  • adopt,
  • devote,
  • function,
  • operation,
  • effectivity,
  • commit,
  • imitate,
  • Skilfulness,
  • troy weight,
  • impression,
  • vantage ground,
  • avail.

Paraphrases for Efficacy:

• Equivalence

  • Adjective
    effectiveness, efficient.
  • Proper noun, singular
    efficiencies, effectiveness.
  • Noun, singular or mass
    effectiveness.
  • Adverb
    effectiveness.
  • Verb, non-3rd person singular present
    effectiveness, efficient.
  • Verb, base form
    effectiveness.

• Independent

  • Adjective
    efficacious, ineffective, therapeutic.
  • Proper noun, singular
    efficient.
  • Noun, singular or mass
    usefulness, effect, efficacious, appropriateness, ineffectiveness, inefficiency, efficient.

• Other Related

  • Adjective
    effective.
  • Proper noun, singular
    trials, effective.
  • Noun, singular or mass
    effective.
  • Verb, non-3rd person singular present
    effective.
  • Verb, base form
    effective, efficient.

Antonyms for Efficacy:

• n.

  • capability
    inability, ineptness, impotence, incompetence.
  • effectiveness
    ineffectiveness, unproductivity.
  • efficacy
    inefficacy, uselessness, unproductiveness, weakness, inefficiency, failure.
  • efficiency
    helplessness.
  • energy
    tiredness, idleness, lethargy, inactivity, laziness.
  • might
    powerlessness.
  • potency
    disability, impotency.
  • Other antonyms:
    imbecility, ineffectualness, dulness, feebleness, inadequateness, incapacity, ineffectuality, inaptitude, maladroitness, inadequacy, awkwardness, incompetency, stupidity.

Homophones for Efficacy:

• effuse, efficacious, euphausiacea, epic, efface, epizoic, eaves, EbS, Ephesus, effigy, evacuee, epigaea, evoke, euphagus, eohippus, epiphysis, episcia, epos, eyepiece, epoch, epoxy.