1. (adj) hardy, stalwart, stout, sturdy
having rugged physical strength; inured to fatigue or hardships
Synonyms: stouthearted, stout, hardy, portly, dauntless, sturdy, inflexible, stalwart, tough, uncompromising, brave, unfearing, fearless, intrepid, audacious
Antonyms: frail, delicate
2. (adj) uncompromising, sturdy, inflexible
not making concessions
Synonyms: stout, hardy, unbending, sturdy, stalwart, tough, uncompromising, inflexible, rigid
Antonyms: delicate, frail
3. (adj) sturdy, tough
substantially made or constructed
Synonyms: knotty, problematic, ruffianly, bad, rugged, toughened, tough, baffling, stout, elusive, hard, sturdy, inflexible, stalwart, uncompromising, hardy, problematical
Antonyms: frail, delicate
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Synonyms for sturdy 
