5
insensible(adjective, strong, hard, tough, severe)
5
intolerant(adjective, hard, severe, cold, indifferent)
5
oppressive(adjective, severe, severity)
5
recalcitrant(adjective, tough, firm, difficult, violent)
5
rocky(adjective, difficult, troubled, inflexible, unyielding)
5
single-minded(adjective, tough, firm, harsh, cruel)
5
stonyhearted(adjective, attitude)
5
stringent(adjective, tough, severe, harsh, cruel)
5
unchangeable(adjective, strong, hard, definite, inflexible)
5
unresponsive(adjective, person, mean, hard, cool)
5
unsparing(adjective, close, strong, hard, tough)
4
brutal(adjective, mean, hard, tough, severe)
4
cold-hearted(adjective, hard, tough, severe, attitude)
4
coldhearted(adjective, hard, cold, indifferent, detached)
4
demanding(adjective, severe)
4
frigid(adjective, mean, hard, cool, harsh)
4
graceless(shameless, impenitence)
4
icy(adjective, mean, hard, cool, tough)
4
incorrigible(adjective, vice)
4
insensate(adjective, hard, tough, severe, careless)
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APASmart Define. (2016). obdurate thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/obdurate/thesaurus/synonyms
ChicagoSmart Define. 2016. "obdurate thesaurus" https://smartdefine.org/obdurate/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, obdurate thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/obdurate/thesaurus/synonyms>.
MLASmart Define. "obdurate thesaurus" 23 March 2016. Web. 23 September 2026. <https://smartdefine.org/obdurate/thesaurus/synonyms>