Available Definitions:
1) a. - Made hard, or compact; made unfeeling or callous; made obstinate or obdurate; confirmed in error or vice.
2) v. t. - To accustom by labor or suffering to endure with constancy; to strengthen; to stiffen; to inure; also, to confirm in wickedness or shame; to make unimpressionable.
3) v. i. - To become hard or harder; to acquire solidity, or more compactness; as, mortar hardens by drying.
4) v. i. - To become confirmed or strengthened, in either a good or a bad sense.