367 entries under hard topic. ×

5
indomitable(adjective, strong, great, difficult)
5
thick(adjective, person, set, body, strong)
5
unforgiving(adjective, rough, harsh, cruel)
5
unkind(adjective, mean, cool, severe)
5
vicious(adjective, rough, nasty, harsh)
4
aloof(adjective, calm, mean, cool)
4
concrete(adjective, solid, rigid, inflexible)
4
drastic(adjective, rough, harsh, rude)
4
extreme(adjective, harsh, rude, cruel)
4
hard as nails(expression, adjective, idiom, strong)
4
hardheaded(adjective, strong, determined, unreasonable)
4
immovable(adjective, mean, strong, determined)
4
inelastic(adjective, determined, resolute, rigid)
4
mulish(adjective, mean, strong, firm)
4
numb(noun, adjective, severe, cruel)
4
refractory(adjective, rough, firm, grim)
4
set in stone(expression, adjective, idiom, calm, mean)
4
unconcerned(adjective, mean, cool, unpleasant)
4
unmoved(adjective, calm, mean, cool)
4
unshakable(adjective, mean, strong, firm)
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APASmart Define. (2016). tough thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough/thesaurus/synonyms
ChicagoSmart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, tough thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>.
MLASmart Define. "tough thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms>