417 entries under verb topic. ×

3
naturalize(impulse, toughen)
3
numb(thicken, stabilize, toughen, season)
3
settle(close, set, develop, secure)
3
vitiate(feel, emotions, bad action)
3
warp(feel, emotions, bad action)
2
add to(expression, support, increase, develop)
2
become one(expression, meet, join, link)
2
beef up(expression, support, increase, boost)
2
blunt(thicken, stabilize, toughen, season)
2
break in(expression, study, develop, improve)
2
calloused(adjective, jellied, gel, calcify)
2
callus(noun, calcify, thicken, stabilize)
2
chasten
2
close(set, settle, firm, solid)
2
concentrate(develop, secure, join, unite)
2
condense(form, set, develop, secure)
2
condition(prepare, endure, adjust, familiarize)
2
connect(place, set, meet, develop)
2
contract(close, set, settle, firm)
2
cure(noun, preserve, cook, smoke)
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APASmart Define. (2016). harden thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/harden/thesaurus/synonyms
ChicagoSmart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, harden thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>.
MLASmart Define. "harden thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/harden/thesaurus/synonyms>