toughness Synonyms - page 2

durability durity durometer endurance energy firmness flintiness force formidability fortitude ductility doughiness arduousness athleticism backbone brawn brawniness burliness colloidality determination difficultness dilatability glueyness glutinousness inelasticity inflexibility inspissation iron lustiness manliness might mightiness moxie muscularity induration incrassation grit gumminess hardiness hardness harshness health huskiness immovability impenetrability impermeability permanence