222 entries under tough topic. ×

1
in the pink(expression, idiom, strong, fit)
1
incorruptible(adjective, close, strong, correct)
1
insensible(adjective, strong, hard, sturdy)
1
iron-fisted(adjective, severe, harsh, rigid)
1
locked in(expression, adjective, secure, determined)
1
lusty(strong, fit, solid, fresh)
1
mean(adjective, clear, hard, severe)
1
no-nonsense(adjective, severe, harsh, thoughtful)
1
oppressive(adjective, severe, harsh, cruel)
1
perdurable(calm, strong, steady, even)
1
physically fit(expression, strong, fit, fresh)
1
rosy-cheeked(strong, fit, fresh, well)
1
sad(adjective, difficulty, obsolete)
1
safe and sound(expression, adjective, idiom, strong)
1
scrupulous(adjective, close, correct, severe)
1
self-willed(determined, fixed, inflexible, obstinate)
1
square(adjective, severe, honest, harsh)
1
straight(adjective, close, correct, severe)
1
strait-laced(adjective, severe, harsh, solid)
1
stringent(adjective, set, hard, severe)
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APASmart Define. (2016). firm thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/firm/thesaurus/synonyms
ChicagoSmart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, firm thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>.
MLASmart Define. "firm thesaurus" 31 March 2016. Web. 29 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms>