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coal and ice(expression, idiom, insignificant, unimportant, trivial)
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competent
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component
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compulsory
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condemnatory
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critical
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crucial
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decisive
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denouncing
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deprecating
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deprivation
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destined
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drastic
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effective
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efficient
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elemental
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eventual
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expedient
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functional
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fundamental
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APASmart Define. (2015). needless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/needless/thesaurus/antonyms
ChicagoSmart Define. 2015. "needless thesaurus" https://smartdefine.org/needless/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, needless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/needless/thesaurus/antonyms>.
MLASmart Define. "needless thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/needless/thesaurus/antonyms>