fort/fortress

Antonyms: weak, vulnerable, frail, fragile, delicate, faint, mild, frangible. stronghold, n. fastness, fort, fortress, muniment, donjon, citadel, keep, bulwark. strong-smelling, a. fetid, rank, frowzy, rancid, malodorous, offensive, musty. struggle, n. conflict, contest, strife. struggle, v. strive, cope, grapple, labor. stub, n. stump, counterfoil. stubble, n. eddish, rowen, arrish. stubborn, a. unyielding, obstinate, obdurate, mulish, refractory, indocile, headstrong, inflexible, intractable, perverse, contumacious, impersuadable, recalcitrant, stiff-necked, rugged, persistent, incompliant. stuck-up, a.