Inflexible or without exception.
Made of cast iron.
Durable; tough; resilient.
A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.
unsuitable to needs or circumstances; inappropriate; inapt
Not properly named; See, for example, improper fraction
Not in keeping with conventional mores or good manners; indecent or immodest
Not consistent with established facts; incorrect
Of a complex random variable, correlated with its conjugate
Not according to facts; inaccurate or erroneous