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.
Strong; uncompromising.
Containing only relevant parts; brief and controlled.
Experiencing anxiety or stress.
Under tension, like a stretched bowstring, rope, or sail; tight.
Not flabby; firm, toned; (of a person) having a lean, strong body.
Neat and well-disciplined; (by extension) efficient and in order.
To make taut; to tauten, to tighten.