Synonyms of powerful

1 Syllable
thest, ther, loud, ox
2 Syllables
heftier, hardier, stallion, highly, jocker, zippier, potent, striking, theatric, sturdy, fiercest, able, manful, puissant, fiercer, cogent, jockstrap, plangent, valiant, lustier, manlier, famous, telling, heady, valid, high-up, ablest, forter, violent, trenchant, bullish, colter, heman, ringing, strengthy, wieldy, wicked, weighty, stringent, piercing, brawnier, burlier, robust, manly, hefty, strapping, ruling, stalwart, abler, headier, mighty, studder, brawny, burly, oxer, sturdier, roaring, well-built, hardiest, lusty, muscled, zippy, ropy, hardy, louder, manliest, loudest, four-star, blanket
3 Syllables
full-blooded, robustuous, robustious, athletic, kinetic, influential, paramount, vigorous, sovereign, vehement, resounding, effectual, go-getting, caveman, emphatic, curiously, red-blooded, stout-hearted, two-fisted, lion-hearted, resonant, convincing, forcible, ballbuster, almighty, sonorant, deep-toned, hard-hitting, dramatic, capable, commanding, supreme, efficient, sonorous, muscular, compelling, dynamic, bulletproof, dominant, preeminent, controlling, prevailing, eloquent, fearsome, gogetting, beefcake, sinewy, bigtime, ear-piercing, ear-splitting, full-mouthed, high-sounding, loud-voiced, competent, full-voiced, fullmouthed, top-level, high-level, intense, forceful
4 Syllables
suasive, exceedingly, impassioned, tragicomic, impressive, masculine, extremely, invincible, histrionical, remarkably, effective, reverberant, all-consuming, persuasive, overweighing, significant, privileged, all-powerful, preponderant, convictive, dynamical, decidedly, unusually, overruling, omnipotent, efficacious, advantaged, able-bodied, energetic
5 Syllables
much-publicized, overpowering, overbalancing, authoritarian, terrifically, invulnerable, irresistible, unattackable, unsurmountable
6 Syllables
prohibitively, authoritative