29 entries under vigorously topic. ×

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soberly(adverb, earnestly, actively, sincerely)
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solemnly(adverb, earnestly, actively, sincerely)
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sternly(adverb, seriously, earnestly, actively)
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straighten out(expression, adverb, seriously, earnestly)
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thoughtfully(adverb, seriously, earnestly, actively)
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with a straight face(expression, idiom, adverb, seriously)
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with forethought(expression, adverb, seriously, earnestly)
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with sobriety(expression, adverb, seriously, earnestly)
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zealously(adverb, earnestly, actively, sincerely)
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APASmart Define. (2011). with straight face thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/with_straight_face/thesaurus/synonyms
ChicagoSmart Define. 2011. "with straight face thesaurus" https://smartdefine.org/with_straight_face/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, with straight face thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/with_straight_face/thesaurus/synonyms>.
MLASmart Define. "with straight face thesaurus" 21 May 2011. Web. 29 September 2026. <https://smartdefine.org/with_straight_face/thesaurus/synonyms>