Meaning : Used of persons. Emotionally hardened.
Example :
Faced a case-hardened judge.
Synonyms : case-hardened, hard-boiled
Meaning : Protected against attack (especially by nuclear weapons).
Example :
Hardened missile silos.
Meaning : Converted to solid form (as concrete).
Synonyms : set
Probable antonyms of hardened :- soft, soften, unhardened, untempered