powerful

adv.

[1]	mighty , mightily , right

adj.

[1]	potent , strong , mighty , vigorous , robust , energetic , sturdy , stalwart , tough , resilient , dynamic
[2]	influential , knock-down , strong , compelling , forceful , potent , substantial , weighty , authoritative , effective , important , impressive , telling , effectual , formidable , persuasive
[3]	strong , potent , potent , intense , substantial , great , high
[4]	brawny , hefty , muscular , sinewy
[5]	herculean