sturdy (adj.)

• adamantine
• athletic
• beefy
• bouncing
• brawny
• bulky
• burly
• dense
• determined
• durable
• enduring
• firm
• flush
• forceful
• forcible
• full-blooded
• full-strength
• gutsy
• hale
• hard
• hardy
• hearty
• heavy
• hefty
• husky
• indomitable
• infrangible
• lasting
• lusty
• massive
• mighty
• muscular
• nervy
• obstinate
• potent
• powerful
• puissant
• red-blooded
• resolute
• rigid
• robust
• robustious
• rude
• rugged
• solid
• sound
• stable
• stalwart
• staunch
• steadfast
• steady
• steely
• stout
• strapping
• strong
• strong-willed
• substantial
• tenacious
• tough
• unbreakable
• uncompromising
• unfaltering
• unswerving
• unwavering
• unyielding
• vigorous
• vital
• well-founded
• well-grounded
• well-made