16
hardened(noun, verb, adjective, set, hard)
12
tempered(verb, adjective, strengthened)
8
tough(noun, adjective, strong, hard, careless)
7
reinforced(verb, strengthened)
7
strengthened(verb, strengthened)
7
treated
6
callous(noun, adjective, hard, cruel, unfeeling)
6
inured(noun, adjective, hard, careless, indifferent)
6
rugged(adjective, strong, permanent, indestructible)
6
set
5
annealed
5
calloused
5
experienced(adjective, hardened, veteran)
5
fortified(verb, adjective, strengthened)
5
indurated(verb, adjective, hard, careless, indifferent)
5
seasoned(adjective, hard, unfeeling, unsympathetic, experienced)
4
case-hardened(noun, adjective, hard, careless, indifferent)
4
hard(adjective, strong, careless, indifferent, cruel)
4
solidified
4
steeled(noun, verb, adjective, set, hard)
<1234510>
11 years ago|9.8k views|share |citing 
APASmart Define. (2015). toughened thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/toughened/thesaurus/synonyms
ChicagoSmart Define. 2015. "toughened thesaurus" https://smartdefine.org/toughened/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, toughened thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/toughened/thesaurus/synonyms>.
MLASmart Define. "toughened thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/toughened/thesaurus/synonyms>