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having a killer instinct(expression, idiom)
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heartless
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iceberg
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immune to
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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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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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laid back
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machine-driven
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matter of fact(expression, idiom)
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APASmart Define. (1970). without rhyme or reason thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/without_rhyme_or_reason/thesaurus/related
ChicagoSmart Define. 1970. "without rhyme or reason thesaurus" https://smartdefine.org/without_rhyme_or_reason/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, without rhyme or reason thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/without_rhyme_or_reason/thesaurus/related>.
MLASmart Define. "without rhyme or reason thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/without_rhyme_or_reason/thesaurus/related>