Harden
"Harden" in Latin
dūrescō
(to become hard)
dūrō
(to make hard(er))
firmo
(to become or make less sensitive)
firmō
(to make hard(er))
obdūrefaciō
(to make hard(er))
rigēscō
(to become hard)
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.