Synonyms of tougher

1 Syllable
hard, firm, stiff, stout, tight, fit
2 Syllables
strapping, stalwart, rugged, mighty, healthy, dense, brawny, flinty, steeled, rigid, molded, lusty, fibrous, solid, hardy, robust
3 Syllables
unyielding, durable, hardened, leathery, withstanding, resistant, vigorous, tenacious, seasoned, sinewy, resilient, hard-bitten
4 Syllables
unbreakable, cohesive, inflexible, conditioned
5 Syllables
indigestible