Obdurately set or determined; doggedly obstinate; stubborn; sulky: used of persons.Having great force or endurance; strong in attack or resistance; vigorous; hardy; stout; lusty; robust: as, a sturdy opponent; sturdy pioneers; sturdy legs; a sturdy tree.Firmly fixed or settled; resolute; unyielding; hard to overcome: used of things.Synonyms Stout, Stalwart, etc. (see robust), brawny, sinewy, muscular, firm.n. A disease of sheep caused by the presence in the brain of the eœenurus, or cystic larval form of the dog's tapeworm, Tænia cœnurus.