102 entries under cruel topic. ×

127
firm(noun, adjective, feature, state, characteristic)
112
rigid(adjective, feature, state, characteristic, strong)
106
hard(adjective, feature, state, characteristic, hard)
81
unyielding(adjective, strong, hard, tough, strain)
52
inflexible(adjective, hard, tough, severe, rough)
48
stubborn(adjective, hard, tough, rough, firm)
39
inexorable(adjective, tough, severe, firm, harsh)
39
uncompromising(adjective, hard, tough, severe, rough)
39
resolute(adjective, strong, hard, tough, severe)
39
unbending(adjective, hard, correct, severe, rough)
36
determined(adjective, strong, harsh, solid)
36
obdurate(adjective, hard, tough, severe, rough)
32
unrelenting(adjective, tough, severe, firm, harsh)
29
relentless(adjective, tough, severe, firm, harsh)
23
tough(adjective, strong, hard, severe, rough)
22
adamant(adjective, hard, rough, firm, harsh)
20
severe(adjective, hard, tough, rough, firm)
16
austere(adjective, hard, severe, rough, difficult)
15
harsh(adjective, upset, hard, severe, rough)
14
strict(adjective, hard, tough, severe, rough)
10 years ago|48k views|share |citing 
APASmart Define. (2015). stiff thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, stiff thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>.
MLASmart Define. "stiff thesaurus" 24 December 2015. Web. 27 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms>