Synonyms|173Antonyms|28|Broader|0Narrower|0Related|121
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hardboiled
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hardened
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having a killer instinct(expression, idiom)
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iceberg
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immune to
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impassible
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impassive
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imperceptive
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impervious to
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indifferent
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inexcitable
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inhuman
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inhumane
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insensitive
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insusceptible
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iron-fisted
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iron-hearted
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ironfisted
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just watching the clock(expression, idiom)
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laborsaving
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ChicagoSmart Define. 2015. "unimpressible thesaurus" https://smartdefine.org/unimpressible/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 2015, unimpressible thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/unimpressible/thesaurus/related>.
MLASmart Define. "unimpressible thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/unimpressible/thesaurus/related>