Powerful
Powerful, brawny, powerfully built, sturdy, burly, robust, athletic, tough, stalwart, mighty, lusty, strong as an ox/horse/lion, hunky, ripped, buff, muscular, well built, strapping, hefty, meaty, fit, vigorous, rugged, staunch, hardy, Herculean, beefy, husky, shredded, and jacked.
Forceful
Compelling
Compelling, forceful, potent, convincing, effective, sound, well founded, impressive, influential, cogent, powerful, weighty, plausible, efficacious, valid, telling, persuasive, and authoritative.
Intense
Intense, vehement, ardent, fervid, deep-seated, extreme, fierce, passional, forceful, passionate, fervent, profound, consuming, acute, and perfervid.
Firm
Secure
Secure, indestructible, well defended, impregnable, inviolable, fortress-like, durable, heavy-duty, sturdy, substantial, resistant, imperishable, enduring, well built, well fortified, well protected, impenetrable, unassailable, solid, hard-wearing, tough, well made, rugged, resilient, and long-lasting.
Well
Well, in good health, fighting fit, vigorous, thriving, in rude health, hale and hearty, in good shape, in good condition, in fine fettle, sound in body and limb, fit as a fiddle, healthy, fit, robust, blooming, bursting with health, hale, hearty, in excellent shape, in good trim, sound, in the pink, and in tip-top condition.
9. keen
Keen, deep, dedicated, fervent, enthusiastic, staunch, steadfast, eager, acute, passionate, zealous, earnest, loyal, and fierce.
11. loud
Loud, forceful, stentorian, sonorous, full, deep, penetrating, clear, fruity, powerful, lusty, resonant, orotund, rich, booming, carrying, strident, and canorous.
Highly flavoured
Highly flavoured, flavourful, savoury, aromatic, tangy, biting, spicy, flavorous, strongly flavoured, flavoursome, pungent, piquant, sharp, zesty, hot, and sapid.
Concentrated
Concentrated, highly flavoured, intoxicating, hard, potent, spirituous, intoxicant, undiluted, alcoholic, inebriating, heady, stiff, and vinous.