5
objective(adjective, hard, sound, tough, rational)
5
practical(adjective, calm, hard, sound, tough)
5
unconcerned(adjective, calm, hard, careless, indifferent)
5
unromantic(adjective, hard, sound, reasonable, sensible)
4
adamant(adjective, person, mean, strong, hard)
4
chilly(adjective, person, indifferent, feelings, detached)
4
cold-hearted(adjective, hard, attitude, cold, cruel)
4
detached(adjective, indifferent, distant, unfeeling, remote)
4
earthy(adjective, hard, sound, simple, tough)
4
hands-on(applied, real-world)
4
hardheaded(adjective, strong, hard, sound, tough)
4
insensate(noun, adjective, bad, hard, careless)
4
inured(noun, adjective, hard, careless, indifferent)
4
numb(noun, adjective, insensitive)
4
passionless(adjective, detached, impassive, unresponsive, insensitive)
4
sober(adjective, calm, dull, hard, sound)
4
unbending(adjective, mean, strong, hard, tough)
4
uncaring(adjective, bad, hard, careless, cold)
4
unkind(adjective, bad, hard, tough, severe)
4
well-versed
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APASmart Define. (2016). hard-boiled thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/hard-boiled/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-boiled thesaurus" https://smartdefine.org/hard-boiled/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, hard-boiled thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/hard-boiled/thesaurus/synonyms>.
MLASmart Define. "hard-boiled thesaurus" 23 March 2016. Web. 26 September 2026. <https://smartdefine.org/hard-boiled/thesaurus/synonyms>