a.
1.
Bold ( from coarseness or rudeness ), obstinate, dogged, stubborn, pertinacious, firm, stiff, hardy, persevering.
2.
Strong, lusty, robust, stout, stalwart, athletic, brawny, muscular, hardy, vigorous, powerful, forcible, well-set, thick-set.
3.
Stiff, stout, strong, hardy, firm.