EFFECTIVE

adj. 1 effectual, efficacious, productive; capable, useful, serviceable, competent, operative, able, functional, efficient The effective life of the battery is six months 2 impressive, remarkable, noticeable, conspicuous, outstanding, striking, powerful, compelling, moving, telling, effectual The stage setting was very effective 3 operative, operational, in operation, functioning, real, actual, essential, basic, true The monthly interest may seem low, but the effective annual rate is much higher