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.
Well grounded or justifiable, pertinent.
Of an argument: whose conclusion is always true whenever its premises are true.
Genuine - as distinguished from efficient or regular - sacrament.
Related to the current topic, or presented within context, relevant.
Of a formula or system: such that it evaluates to true regardless of the input values.
Acceptable, proper or correct; in accordance with the rules.