94 entries under hard topic. ×

11
intractable(adjective, firm, difficult, determined)
10
dogged(adjective, mean, determined, fixed)
10
set in stone(expression, adjective, idiom, mean)
10
staunch(adjective, set, strong, firm)
8
unswayable(adjective, determined, resolute, obstinate)
7
hanging tough(expression, adjective, mean, determined)
7
implacable(adjective, mean, strong, tough)
7
pigheaded(adjective, mean, determined, usual)
7
unalterable(adjective, set, steady, regular)
6
grim(adjective, strong, tough, determined)
6
immutable(adjective, set, steady, regular)
6
iron(adjective, mean, strong, tough)
6
steely(adjective, strong, tough, determined)
6
stiff-necked(adjective, mean, strong, tough)
5
hardheaded(adjective, strong, tough, determined)
5
perverse(adjective, mean, wild, determined)
5
rigorous(adjective, set, strong, tough)
4
severe(adjective, strong, tough, cruel)
4
tough(adjective, mean, strong, determined)
4
uncompliant(adjective, firm, determined, resolute)
11 years ago|12k views|share |citing 
APASmart Define. (2015). immovable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 23 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>