Словарь синонимов английского языка - 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, drue: The monthly interest may seem low, but the effective annual rate is much higher.