2
close(verb, set, fix, settle, firm)
2
coarsen
2
concrete(verb, close, set, firm, dry)
2
congeal(verb, close, set, fix, settle)
2
contract(verb, close, set, fix, settle)
2
crystallize(verb, close, set, fix, settle)
2
densify(verb, close, set, fix, settle)
2
empower(verb, support, increase, establish, extend)
2
encourage(verb, restore, strengthen, hearten)
2
enhance(verb, support, increase, establish, extend)
2
enliven(verb, strengthen)
2
firm(verb, close, set, fix, settle)
2
fix(verb, close, set, settle, firm)
2
hardened
2
hardening
2
hearten(encourage, restore, strengthen)
2
precipitate(verb, close, set, fix, settle)
2
press(verb, close, set, fix, settle)
2
refresh
2
rejuvenate(verb, support, increase, encourage, establish)
11 years ago|4.3k views|share |citing 
APASmart Define. (2015). toughen thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/toughen/thesaurus/synonyms
ChicagoSmart Define. 2015. "toughen thesaurus" https://smartdefine.org/toughen/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, toughen thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/toughen/thesaurus/synonyms>.
MLASmart Define. "toughen thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/toughen/thesaurus/synonyms>