potent

potent adjective able, active, affecting, capable, commanding, compelling, convincing, dominant, dramatic, dynamic, effective, effectual, efficacious, energetic, forceful, forcible, formidable, generative, impelling, important, impressive, indefatigable, influential, inspiring, inspiriting, intense, manly, masterful, mighty, moving, operative, powerful, predominant, prepotent, prevailing, productive, puissant, ruling, stiff, strong, telling, trenchant, useful, valid, vigorous, virile, weighty

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See also: absolute, assertive, capable, cogent, compelling, considerable, convincing, efficient, in full force, indomitable, inexpugnable, influential, irresistible, omnipotent, operative, persuasive, powerful, predominant, prevailing, productive, sound, sovereign, strong, valid, virtual