Definition for Efficacy:

• Efficacious.

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.
  •performance (noun)
  • operation,
  • practice,
  • conduct,
  • running,
  • working,
  • functioning,
  • exercise,
  • pursuit.
  •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.

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.

Efficacy Sentence Examples:

• Again Greek fire had proved its deadly efficacy.

• Neither does the fact that the sacraments are administered by the unworthy detract from their efficacy, because, on account of the call of the Church, they represent the person of Christ, and do not represent their own persons, as Christ testifies, Luke 10, 16: He that heareth you heareth Me.

Homophones for Efficacy:

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