1. (verb) harden, indurate
become hard or harder
Synonyms: inure, harden, indurate, season, temper
Antonyms: soften
2. (verb) harden, indurate
make hard or harder
Synonyms: inure, harden, indurate, season, temper
Antonyms: soften
3. (verb) temper, harden
harden by reheating and cooling in oil
Synonyms: temper, season, chasten, anneal, mollify, moderate, indurate, harden, inure, normalize
Antonyms: soften
4. (verb) season, harden
make fit
Synonyms: temper, season, mollify, flavour, harden, flavor, inure, indurate
Antonyms: soften
5. (verb) inure, harden, indurate
cause to accept or become hardened to; habituate
Synonyms: harden, indurate, season, inure, temper
Antonyms: soften
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Synonyms for harden 
