Definition of HARDEN

to become physically firm or solid <the glue begins to harden as soon as it is exposed to air>
Antonyms liquefy (also liquify), soften
to make able to withstand physical hardship, strain, or exposure <pioneer women who had been hardened by years of living on the plains>
Antonyms soften
to increase the ability of (as a muscle) to exert physical force <arm muscles that were hardened by all the years of casting and hauling his fishing nets>
Synonyms beef (up), fortify, harden, toughen
to make more harsh, uncompromising, or severe <the government hardened restrictions on travel to and from the war-torn nation>
Near Antonyms lessen, moderate, soften
Antonyms ameliorate, ease

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