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3 entries under subitaneous topic. ×

1
off top of head(expression, adjective, idiom, adverb, informal)
1
unanticipated(adjective, violent, fast, quick)
1
without warning(expression, adjective, violent, fast, quick)
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APASmart Define. (2011). off the top of head thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/off_the_top_of_head/thesaurus/synonyms
ChicagoSmart Define. 2011. "off the top of head thesaurus" https://smartdefine.org/off_the_top_of_head/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2011, off the top of head thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/off_the_top_of_head/thesaurus/synonyms>.
MLASmart Define. "off the top of head thesaurus" 23 May 2011. Web. 27 September 2026. <https://smartdefine.org/off_the_top_of_head/thesaurus/synonyms>