Meaning of 'hardened'

adjective

converted to solid form (as concrete)

Synonyms: set

adjective

used of persons

Example: "emotionally hardened"

Synonyms: scheming

adjective

protected against attack (especially by nuclear weapons)

Example: "hardened missile silos"

adjective

made hard or flexible or resilient especially by heat treatment

Synonyms: tempered treated toughened

adjective

made tough by habitual exposure

Example: "hardened fishermen"

Synonyms: enured inured