45 entries under idiom topic. ×

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asleep at the switch(expression, adverb, negligent, ignorantly)
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be unprepared(expression, nonpreparation)
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below par(expression, imperfection)
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found wanting(expression, imperfection)
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from the hip(expression, spontaneous)
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in arrear(expression, incompleteness)
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in default(expression, incompleteness)
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in the rough(expression, nonpreparation)
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lack preparation(expression, nonpreparation)
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lie fallow(expression, nonpreparation)
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lightly cooked
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not on the job(expression, adverb, negligent, ignorantly)
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not perfect(expression, imperfection)
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off one's guard(expression, danger)
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off the hip(expression, impromptu, extemporaneous)
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off top of head(expression, informal, snap, unrehearsed)
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out of order(expression, imperfection)
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out of the blue(expression, unexpectedly, astonishingly, astoundingly)
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out of tune(expression, imperfection)
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rough cast(expression, nonpreparation)
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APASmart Define. (2015). unprepared thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unprepared/thesaurus/synonyms
ChicagoSmart Define. 2015. "unprepared thesaurus" https://smartdefine.org/unprepared/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, unprepared thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unprepared/thesaurus/synonyms>.
MLASmart Define. "unprepared thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/unprepared/thesaurus/synonyms>