Adamant :: Adamant (n.) A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in modern mineralogy it has no technical signification. It is now a rhetorical or poetical name for the embodiment of impenetrable hardness.
Adamantean :: Adamantean (a.) Of adamant; hard as adamant.
Adamantine :: Adamantine (a.) Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains..
Adamantine :: Adamantine (a.) Like the diamond in hardness or luster.
Rhadamanthine :: Rhadamanthine (a.) Of or pertaining to Rhadamanthus; rigorously just; as, a Rhadamanthine judgment..
Rhadamanthus :: Rhadamanthus (n.) One of the three judges of the infernal regions; figuratively, a strictly just judge..