Synonyms: successful, effectual, efficacious, productive, constructive, fruitful, functional, potent, powerful, convincing, compelling, strong, forceful, forcible, weighty, plausible, sound, valid, well founded, telling, operative, in force, in effect, in operation, official, signed and sealed, virtual, practical, essential, actual, implied, implicit, unacknowledged, tacit
Antonyms: ineffective, weak, invalid, theoretical, ineffectual, useless, inefficient, worthless, unproductive, futile, unsuccessful, fruitless, impotent, inadequate, incompetent, abortive, vain, powerless, pointless, inept, unavailing, inefficacious, unable, incapable
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