undurable Antonyms

rheumatic tuff unconquerable undestroyable unflexible unlimber unpassable unsurmountable virgate weatherproof well-set toughish tendinous robustious semisolid sempervirent shellproof soldered spiked stabled statics stayer stock-still windtight feast day strong-arm nonporous solid-state age-long unattackable precast rainproof stonelike rock steady rodlike semirigid immotile unsubduable leakproof leatherlike light-tight lockstep bulletproof raincoat burglarproof durum firmware unmodifiable stormproof air-tight