Synoniemen.net

harden (ww):
endurcir(en) to make hard(er).
(en) to cause to become accustomed to something unpleasant by prolonged exposure.
(ja) 固くする., aguerrir(en) to cause to become accustomed to something unpleasant by prolonged exposure., durcir(en) to make hard(er)., enfoncer(en) to solidify., fixer(en) to solidify., geler(en) to solidify., habituer(en) to cause to become accustomed to something unpleasant by prolonged exposure., prendre effet(en) to cause to become accustomed to something unpleasant by prolonged exposure., régler(en) to solidify.

harden (zn):
trempe(en) rapid cooling of hot metal object.

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