4
stiffened
4
thick-skinned(noun, adjective, hard, careless, indifferent)
3
braced(verb, strengthened)
3
experient
3
invigorated(verb, adjective, strengthened)
3
roughened
3
strong
2
bad
2
burned
2
energized(verb, strengthened)
2
hard-boiled(noun, adjective, hard, careless, indifferent)
2
hardy
2
insensate(noun, adjective, hard, careless, indifferent)
2
insensitive(noun, adjective, hard, careless, indifferent)
2
knowledgeable(experienced, hardened, veteran)
2
mill
2
resistant(adjective, strong, hard, unfeeling, unsympathetic)
2
sturdy
2
supported(verb, strengthened)
2
toughen
11 years ago|9.8k views|share |citing 
APASmart Define. (2015). toughened thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/toughened/thesaurus/synonyms
ChicagoSmart Define. 2015. "toughened thesaurus" https://smartdefine.org/toughened/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, toughened thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/toughened/thesaurus/synonyms>.
MLASmart Define. "toughened thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/toughened/thesaurus/synonyms>