(New American Roget's College Thesaurus)
adj. efficacious, effectual, productive, adequate, telling, potent, active, operative, dynamic; successful; causative; efficient, capable. See power, utility, agency, success, vigor. Ant., ineffective, useless.
(Roget's IV) modif.
Syn. efficient, efficacious, effectual, serviceable, producing the expected result, producing the deSired result, useful, operative, active, in force, in effect, sufficient, adequate, productive, capable, competent, yielding, practical, valid, telling, striking, forceful, powerful, compelling, cogent, trenchant.
Ant. inoperative, useless*, inefficient.
Syn.- effective is applied to that which produces a definite effect or result [ an effective speaker ] ; efficacious refers to that which is capable of producing the deSired effect or result [ an efficacious remedy ] ; effectual specifically implies the production of the deSired effect or result in a decisive manner [ an effectual reply to his charge ] ; efficient implies skill and economy of energy in producing the deSired result and when applied to persons implies competence [ an efficient machine, an efficient worker ]
(Roget's 3 Superthesaurus) a.
1. productive successful, compelling, sufficient, forceful, efficacious, useful, powerful, persuasive.
2. operative functional, serviceable, in effect, active.
ANT.: ineffectual, ineffective, impotent, inadequate
(Roget's Thesaurus II) adjective 1. Producing or able to produce a desired effect: effectual, efficacious, efficient, productive. See THRIVE. 2. Full of or displaying force: dynamic, dynamical, forceful, forcible, hard-hitting, powerful, strong, vigorous. See STRONG. 3. In effect: operational, operative. See BE.

English dictionary for students. 2013.

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