74 entries under idiom topic. ×

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not born yesterday on the lookout(expression, wary, mistrustful, distrustful)
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on safe side(expression, adjective, careful, sure)
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on the QT(expression, mysterious, private, reticent)
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on the defensive(expression, tense, uneasy, bothered)
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on the rims(expression, frugal, parsimonious, thrifty)
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on your guard(expression, alert, attentive, watchful)
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play gooseberry(expression, care)
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secretly mischievous
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set watch(expression, care)
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take good care(expression, caution)
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take heed(expression, caution)
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taking care(expression, care)
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tried and true(expression, adjective, careful, sure)
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unimaginatively conventional
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APASmart Define. (2016). cautious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/cautious/thesaurus/synonyms
ChicagoSmart Define. 2016. "cautious thesaurus" https://smartdefine.org/cautious/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, cautious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/cautious/thesaurus/synonyms>.
MLASmart Define. "cautious thesaurus" 2 March 2016. Web. 27 September 2026. <https://smartdefine.org/cautious/thesaurus/synonyms>