a. сильний, міцний, витривалий, твердий, могутній, дужий, могучий, можний, навальний, солідний, тривкий, чіпкий
adv. дуже

having strength or power greater than average or expected: sinewy, tough, strengthened, knockout, hard, powerful, muscular, brawny, ironlike, strength, bullnecked, weapons-grade, vehement, industrial-strength, beardown, toughened, hefty, virile, knock-down, beefed-up, robust, well-knit, rugged, noticeable, stiff, bullocky, severe, fortified, well-set, reinforced
not faint or feeble: intense
having or wielding force or authority: powerful, potent
of good quality and condition; solidly built: solid, sound, substantial
being distilled rather than fermented; having a high alcoholic content: hard, alcoholic
strong and sure: firm, forceful
of verbs not having standard (or regular) inflection: irregular
having a strong physiological or chemical effect: strength, fertile, efficacious, effective, stiff, powerful, effectiveness, potent, multipotent, effectual, potency, equipotent
freshly made or left: fresh, warm
immune to attack; incapable of being tampered with: unattackable, secure, unassailable, invulnerable, impregnable, inviolable