1
enlarge(verb, support, increase, establish, extend)
1
expose(verb, keep, overcome, endure, resist)
1
extend(verb, support, increase, establish, powerful)
1
freeze(verb, close, set, fix, settle)
1
get through(verb, expression, keep, overcome, endure)
1
grow hardened(verb, expression, keep, overcome, endure)
1
grow strong(verb, expression, keep, overcome, endure)
1
habituate(verb, rough, prepare, adjust, scratch)
1
hang tough
1
hard
1
healthy
1
heat up(verb, expression, support, increase, boost)
1
heighten(verb, support, increase, establish, extend)
1
hype(verb, support, increase, boost, sustain)
1
increase(verb, support, establish, extend, boost)
1
jell(verb, close, set, fix, settle)
1
justify(verb, support, increase, establish, extend)
1
lapidify
1
lend a hand(verb, expression, idiom, support, increase)
1
lithify
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>