active, activist, activistic, alive, animated, beefy, bouncy, bounding, breezy, brisk, bubbly, chipper, doughty, ebullient, effervescent, energetic, flush, forceful, forcible, forcy, frisky, full of go, full of life, full of pep, full-blooded, full-strength, gutsy, gutty, hale, hale and hearty, hard, hard as nails, hardy, hearty, hefty, hopping, husky, iron-hard, jumping, leaping, live, lively, lusty, mercurial, mighty, militant, nervy, obstinate, peppy, perky, pert, potent, powerful, prancing, puissant, quicksilver, rebounding, recalcitrant, recoiling, red-blooded, repercussive, resilient, robust, robustious, robustuous, rude, rugged, saltant, saltatorial, saltatory, skipping, smacking, snappy, spanking, spirited, sprightly, springing, spry, stalwart, steely, stout, strapping, strong, strong as brandy, strong as strong, strong-willed, sturdy, vigorous, vital, vivacious, zingy