140 entries under hard topic. ×

1
hang-tough(adjective, strong, tough, harsh)
1
hard-bitten(adjective, tough, harsh, cruel)
1
hard-boiled(adjective, strong, tough, severe)
1
hard-line(adjective, strong, tough, severe)
1
hardened(adjective, tough, harsh, cruel)
1
hardheaded(adjective, strong, tough, severe)
1
impenitent(adjective, tough, harsh, cruel)
1
indomitable(adjective, set, strong, tough)
1
inhumane(adjective, tough, harsh, cruel)
1
insensitive(adjective, tough, harsh, cruel)
1
labored(adjective, tough, rough, difficult)
1
mortified(adjective, strong, tough, severe)
1
mulish(adjective, strong, tough, severe)
1
murder(adjective, tough, severe, rough)
1
sanguinary(adjective, tough, harsh, cruel)
1
serious(adjective, strong, tough, severe)
1
set(adjective, tough, severe, firm)
1
shameless(adjective, tough, harsh, cruel)
1
sour(adjective, tough, harsh, cruel)
1
tiring(adjective, tough, severe, rough)
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APASmart Define. (2016). rigorous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>