hardened

adj. made hard; strengthened; reinforced; secured as to survive a nuclear weapons attack; made tough; experienced an emotional manner as to have become apathetic about something that most people would find difficult or disagreeable

v. make hard or tough; become hard or tough; strengthen, forge; be forged

Adjective
1. used of persons; emotionally hardened; "faced a case-hardened judge"
(synonym) case-hardened, hard-boiled
(similar) hard
2. made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass"
(synonym) tempered, treated, toughened
(similar) annealed
3. 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
(synonym) enured, inured
(similar) tough, toughened
4. converted to solid form (as concrete)
(synonym) set
(similar) hard

Verb
1. become hard or harder; "The wax hardened"
(synonym) indurate
(antonym) soften
(hypernym) change
(hyponym) encrust, incrust
(verb-group) indurate
(derivation) hardening, solidifying, solidification, set, curing
2. make hard or harder; "The cold hardened the butter"
(synonym) indurate
(antonym) soften
(hypernym) change
(hyponym) face-harden
(cause) indurate
(verb-group) indurate
(derivation) hardening
3. harden by reheating and cooling in oil; "temper steel"
(synonym) temper
(hypernym) modify
4. make fit; "This trip will season even the hardiest traveller"
(synonym) season
(hypernym) toughen
5. cause to accept or become hardened to; habituate; "He was inured to the cold"
(synonym) inure, indurate
(hypernym) habituate, accustom
(hyponym) callous, cauterize, cauterise

(imp. & p. p.)
of Harden
  

(a.)
Made hard, or compact; made unfeeling or callous; made obstinate or obdurate; confirmed in error or vice.
  

Pertaining to the condition of a facility with protective features that enable it to withstand destructive forces, such as explosions, natural disasters, or ionizing radiation. (188 )

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