61 entries under tough topic. ×

3
set in stone(expression, adjective, idiom, secure)
2
obdurate(adjective, determined, fixed, stiff)
2
obstinate(adjective, firm, determined, usual)
2
pigheaded(adjective, determined, usual, regular)
2
resolute(adjective, secure, firm, determined)
2
single-minded(adjective, firm, cruel, stiff)
2
uncompromising(adjective, secure, firm, steady)
2
unyielding(adjective, hard, determined, fixed)
1
astute(adjective, hard, sharp, practical)
1
awkward(adjective, difficult, wild, obstinate)
1
bullheaded(adjective, severe, wild, awkward)
1
cantankerous(adjective, difficult, wild, awkward)
1
contrary(adjective, difficult, wild, determined)
1
crisp(adjective, firm, fixed, distant)
1
difficult(adjective, wild, awkward, obstinate)
1
distant(adjective, firm, fixed, rigid)
1
do or die(expression, adjective, idiom, firm)
1
dug in(expression, adjective, secure, firm)
1
firm(adjective, secure, severe, determined)
1
formal(adjective, firm, fixed, distant)
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APASmart Define. (2013). locked in thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/locked_in/thesaurus/synonyms
ChicagoSmart Define. 2013. "locked in thesaurus" https://smartdefine.org/locked_in/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2013, locked in thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/locked_in/thesaurus/synonyms>.
MLASmart Define. "locked in thesaurus" 18 May 2013. Web. 29 September 2026. <https://smartdefine.org/locked_in/thesaurus/synonyms>