92 entries under inflexible topic. ×

10
unyielding(adjective, set, strong, hard, sound)
8
condensed(adjective, set, hard, tough, heavy)
8
rocky(adjective, set, strong, hard, firm)
6
solidified(adjective, set, hard, tough, firm)
5
immobile(adjective, strong, secure, fixed, impassive)
5
jelled(adjective, set, hard, tough, firm)
5
resistant(adjective, strong, hard, tough, fit)
5
stationary(adjective, calm, strong, fixed, constant)
5
stony(adjective, hard, firm, stiff, rigid)
5
unbending(adjective, hard, firm, stiff, tense)
4
congealed(adjective, set, hard, tough, firm)
4
frozen(adjective, hard, firm, stiff, tense)
4
impermeable(adjective, close, set, hard, tough)
4
rooted(adjective, strong, hard, secure, steady)
4
steely(adjective, hard, firm, stiff, tense)
3
attached(adjective, secure, rigid, stubborn)
3
hardened(adjective, set, strong, hard, tough)
3
hardheaded(adjective, firm, obstinate, stubborn)
3
inelastic(adjective, hard, tough, severe, firm)
2
brittle(adjective, hard, firm, stiff, tense)
10 years ago|51k views|share |citing 
APASmart Define. (2016). solid thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/solid/thesaurus/synonyms
ChicagoSmart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, solid thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>.
MLASmart Define. "solid thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms>