161 entries under tough topic. ×

1
hard-shell(adjective, strong, hard, severe)
1
hard as nails(expression, adjective, idiom, hard)
1
headstrong
1
immovable(adjective, mean, strong, hard)
1
impassive(adjective, calm, hard, careless)
1
impersonal(adjective, rational, straightforward, sober)
1
inexorable(adjective, mean, strong, hard)
1
iron(adjective, mean, hard, harsh)
1
levelheaded(adjective, calm, hard, sound)
1
lifeless(adjective, rational, straightforward, sober)
1
mean(adjective, hard, severe, sharp)
1
mortified(adjective, strong, hard, severe)
1
mulish(adjective, mean, strong, hard)
1
mundane(adjective, simple, rational, straightforward)
1
naked(adjective, rational, straightforward, sober)
1
perverse(adjective, mean, hard, harsh)
1
phlegmatic(adjective, rational, straightforward, detached)
1
pigheaded(adjective, mean, hard, sharp)
1
plain(adjective, calm, sensible, dark)
1
prosaic(adjective, hard, sound, rational)
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APASmart Define. (2016). hard-boiled thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/hard-boiled/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-boiled thesaurus" https://smartdefine.org/hard-boiled/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, hard-boiled thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/hard-boiled/thesaurus/synonyms>.
MLASmart Define. "hard-boiled thesaurus" 23 March 2016. Web. 1 October 2026. <https://smartdefine.org/hard-boiled/thesaurus/synonyms>