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.
Resolute or strenuously active.
Excellent, very good.
Exceedingly violent, severe, ferocious, cruel or savage.
Of exceptional quality, exhibiting boldness or chutzpah.
Threatening in appearance or demeanor.
Extremely; very.