125 entries under expression topic. ×

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mount guard(idiom, care)
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not born yesterday on the lookout(idiom, wary, mistrustful, distrustful)
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not rash(tactful, circumspect)
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on safe side(adjective, idiom, careful, sure)
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on the QT(idiom, mysterious, private, reticent)
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on the defensive(idiom, tense, uneasy, bothered)
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on the rims(idiom, frugal, parsimonious, thrifty)
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on your guard(idiom, alert, attentive, watchful)
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play gooseberry(idiom, care)
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secretly mischievous
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set watch(idiom, care)
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take good care(idiom, caution)
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take heed(idiom, caution)
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taking care(idiom, care)
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tried and true(adjective, idiom, careful, sure)
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under cover(secretive, conspiratorial)
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under wraps(sneaky, covert, secretive)
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unimaginatively conventional
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unsociable constrained(quiet, aloof, peaceful, reticent)
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watch out(verb, phrasal verb)
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APASmart Define. (2016). cautious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/cautious/thesaurus/synonyms
ChicagoSmart Define. 2016. "cautious thesaurus" https://smartdefine.org/cautious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, cautious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/cautious/thesaurus/synonyms>.
MLASmart Define. "cautious thesaurus" 2 March 2016. Web. 22 September 2026. <https://smartdefine.org/cautious/thesaurus/synonyms>