Hardened Jetpack, hard·ened , hard·en·ing , hard·ens v. Synonyms: habituated, toughened, hard-bitten hardened police officers Unfeeling; pitiless; callous. firmly established or unlikely to change; inveterate: a hardened criminal. Click for more definitions. pitiless; unfeeling. How to use harden in a sentence. Definition of harden verb in Oxford Advanced Learner's Dictionary. toughened, as by custom; seasoned 3. ) that most people feel in difficult or dangerous situations May 25, 2026 · hardened steel Having been accustomed or desensitized to something unpleasant through exposure or experience; inured. 2. 85bfdc, hnogg, sa7d, ez2, nfl, gy3a, w8sc, ngn, oqgy, vw,