harden
1. [ verb ] become hard or harder
Synonyms: indurate
Examples:

"The wax hardened"

Related terms: soften change calcify cure callus encrust
2. [ verb ] make fit
Synonyms: season
Examples:

"This trip will season even the hardiest traveller"

Related terms: toughen
3. [ verb ] (metallurgy) harden by reheating and cooling in oil
Synonyms: temper
Examples:

"temper steel"

Related terms: modify temper
4. [ verb ] make hard or harder
Synonyms: indurate
Examples:

"The cold hardened the butter"

Related terms: soften change change callus face-harden
5. [ noun ] Last name, frequency rank in the U.S. is 1123
6. [ verb ] cause to accept or become hardened to; habituate
Synonyms: inure indurate
Examples:

"He was inured to the cold"

Related terms: habituate steel_oneself_against callous
Similar spelling:   hardened
  hardening
  harridan
  Hardeman
  Harten
  Hardin
  Hardman
  Harding
  hard-on
  Hardnett
  hardness
  hardiness
  Hardimon
  Hardiman
  hard_news
  hairtonic