Synonyms for powerful

modified

1. Wielding power

   mighty, all-powerful, almighty, superhuman, omnipotent, overpowering, great, invincible, dominant, indomitable, influential, authoritative, overruling, potent, puissant, forceful, forcible, compelling, ruling, prevailing, preeminent, commanding, supreme, highest, important, authoritarian, charismatic, paramount, ruthless, in the saddle, having the upper hand, in control; see also predominant 1.

   Antonyms weak*, incompetent, impotent.

2. Strong

   robust, stalwart, sturdy; see strong 1, 2.

3. Effective

   efficacious, effectual, convincing; see persuasive.