| a. | 1. | Made hard, or harder, or compact; made unfeeling or callous; made obstinate or obdurate; confirmed in error or vice. |
| 2. | Rendered resistant to the effects of nearby explosions; | |
| 3. | Experienced and inured to hardship; | |
| 4. | Strongly habituated to a certain type of behavior, and unlikely to change; |
| Adj. | 1. | hardened - used of persons; emotionally hardened; "faced a case-hardened judge" Synonyms: case-hardened, hard-boiled |
| 2. | hardened - made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass" | |
| 3. | hardened - made tough by habitual exposure; "hardened fishermen"; "a peasant, dark, lean-faced, wind-inured"- Robert Lynd; "our successors...may be graver, more inured and equable men"- V.S.Pritchett | |
| 4. | hardened - converted to solid form (as concrete) Synonyms: set |