Synonyms|804Antonyms|109|Broader|18Narrower|40Related|457

97 entries under toughen topic. ×

1
enhance(verb, support, increase, establish, extend)
1
enlarge(verb, support, increase, establish, extend)
1
extend(verb, support, increase, establish, powerful)
1
heighten(verb, support, increase, establish, extend)
1
increase(verb, support, establish, extend, boost)
1
justify(verb, support, increase, establish, extend)
1
make callous(verb, expression, calcify, thicken, stabilize)
1
make firm(verb, expression, support, set, increase)
1
make ready(verb, expression, study, develop, improve)
1
mount(verb, support, increase, establish, extend)
1
multiply(verb, support, increase, establish, extend)
1
powerful(verb, support, increase, establish, extend)
1
prepare(verb, support, study, develop, improve)
1
ready(verb, support, encourage, restore, uphold)
1
regenerate(verb, support, increase, establish, extend)
1
rejuvenate(verb, support, increase, raise, establish)
1
render insensitive(verb, expression, calcify, thicken, stabilize)
1
renew(verb, support, increase, raise, establish)
1
rise(verb, form, support, set, increase)
1
roughen(verb, calcify, thicken, stabilize)
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ChicagoSmart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, harden thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>.
MLASmart Define. "harden thesaurus" 24 March 2016. Web. 1 October 2026. <https://smartdefine.org/harden/thesaurus/synonyms>