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a. Having an intended or expected effect.
b. Producing a strong impression or response; striking: gave an effective performance as Othello.
2. Operative; in effect: The law is effective immediately.
3. Existing in fact; actual: a decline in the effective demand.
4. Prepared for use or action, especially in combat.
A soldier or a piece of military equipment that is ready for combat.

ef·fec′tive·ness, ef′fec·tiv′i·ty n.
Synonyms: effective, effectual, efficacious
These adjectives mean producing or capable of producing a desired effect: an effective reprimand; an effectual complaint; an efficacious remedy.



blockbuster Something extremely forceful, violent, or effective; a success, a winner, a hit. The term owes its origin to the name given the highly destructive bombs dropped on industrial targets in Britain during World War II.

corker A clincher or a sockdolager, something that settles the question or closes the discussion; also, a lollapalooza; something striking, astonishing, or extraordinary. In use since 1837, this slang term probably derives from the image of a cork “capping a bottle” (the first three meanings) or flying off a champagne bottle with a bang (the latter meanings). Corker was also a baseball term in the late 19th century.

haymaker Any extremely forceful or effective argument, statement, ploy, maneuver, etc., especially a decisive and culminating one. The term is boxing slang for a violent punch or knockout blow. Hay is grass or alfalfa which has been cut or mowed down. Similarly, the recipient of a haymaker in a pugilistic encounter is “cut down.” Mow (someone) down is a related expression.

I deliberately pulled my right back and swung “haymakers” at Choinyski, intending to miss him. (J. J. Corbett, Roar of the Crowd, 1925)

the old one-two Any especially effective combination of two persons or things; a double whammy. The reference is to boxing and the highly effective combination punch consisting of a left jab immediately followed by a hard right cross, usually to the opponent’s jaw and intended as a knockout blow.

put teeth into To make effective or enforceable; to give meaning or substance to. Webster’s Third cites a contemporary use by E. O. Hauser:

… started turning out the arms which would put teeth into neutrality.

The expression is most often used with reference to legislation.

sledge-hammer argument A single statement or ploy which completely dissolves the opposition in a disagreement; a clincher. A sledge-hammer is a large, weighty hammer which, if used as a weapon, can easily incapacitate the victim. This expression is heard infrequently today.

ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.effectiveness - power to be effective; the quality of being able to bring about an effect
power, powerfulness - possession of controlling influence; "the deterrent power of nuclear weapons"; "the power of his love saved her"; "his powerfulness was concealed by a gentle facade"
incisiveness, trenchancy - keenness and forcefulness of thought or expression or intellect
efficaciousness, efficacy - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine"
ineffectiveness, ineffectuality, ineffectualness - lacking the power to be effective
2.effectiveness - capacity to produce strong physiological or chemical effects; "the toxin's potency"; "the strength of the drinks"
power, powerfulness - possession of controlling influence; "the deterrent power of nuclear weapons"; "the power of his love saved her"; "his powerfulness was concealed by a gentle facade"


noun power, effect, efficiency, success, strength, capability, use, validity, usefulness, potency, efficacy, fruitfulness, productiveness the effectiveness of computers as an educational tool


The power or capacity to produce a desired result:


[ɪˈfektɪvnɪs] N
1. (= efficiency) [of method, system] → eficacia f, eficiencia f; [of treatment, deterrent, argument] → eficacia f
2. (= striking quality) → efecto m


[ɪˈfɛktɪvnɪs] n [action, method] → efficacité f


(= successfulness)Wirksamkeit f; (of strategy, government, politician)Effektivität f
(= striking effect)Wirkung f


[ɪˈfɛktɪvnɪs] nefficacia


n. eficacia, efectividad.


n eficacia, efectividad f; (clinical research) eficacia bajo condiciones normales (See note under efficacy.)