2
trained(adjective, experienced, hardened, veteran)
2
unbreakable(adjective, strong, tough)
2
unfeeling(noun, adjective, hard, careless, indifferent)
2
unsentimental(adjective, cynical, hard-boiled, hard-bitten)
1
acclimated
1
accustomed(adjective, hard, unfeeling, unsympathetic, hardened)
1
apathetic(adjective, hard, careless, indifferent, cruel)
1
backed
1
battle-scarred(experienced, hardened, veteran)
1
benumbed(adjective, hard, unfeeling, unsympathetic, hardened)
1
blind to(expression, adjective, hard, careless, indifferent)
1
buttressed(verb, strengthened)
1
calcified
1
careless(adjective, hard, indifferent, cruel, apathetic)
1
cast-iron
1
coarsened
1
cold(adjective, hard, careless, indifferent, cruel)
1
cold-blooded(adjective, hard, careless, indifferent, cruel)
1
coldhearted(adjective, hard, unfeeling, unsympathetic, hardened)
1
concreted
11 years ago|9.8k views|share |citing 
APASmart Define. (2015). toughened thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/toughened/thesaurus/synonyms
ChicagoSmart Define. 2015. "toughened thesaurus" https://smartdefine.org/toughened/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, toughened thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/toughened/thesaurus/synonyms>.
MLASmart Define. "toughened thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/toughened/thesaurus/synonyms>