Durable; tough; resilient.
Inflexible or without exception.
Made of cast iron.
A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.
Requiring strength or vigor.
Sensible (of intellect etc.); straightforward, not given to or confused by uncertainty or subtlety.
Designed or evolved in such a way as to be resistant to total failure despite partial damage.
Not greatly influenced by errors in assumptions about the distribution of sample errors.
Resistant or impervious to failure regardless of user input or unexpected conditions.
Of an individual or skeletal element: strongly built; muscular; not gracile.
Violent; rough; rude.
Evincing strength and health; strong; (often, especially) both large and healthy.