34 entries under adverb topic. ×

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occasionally(infrequently, intermittently, sporadically)
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off-and-on
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on-and-off(variable, intermittent, uncertainly, infrequently)
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once in a blue moon
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once in a while(infrequently, intermittently, sporadically)
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periodically(infrequently, intermittently, sporadically)
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rarely
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scarcely(variable, vacillating)
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seldom
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sparingly
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uncommonly
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unusually
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vacillating(variable, variably, alternately)
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variable(vacillating, intermittent, infrequently, intermittently)
<12>
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APASmart Define. (2015). at irregular intervals thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/at_irregular_intervals/thesaurus/synonyms
ChicagoSmart Define. 2015. "at irregular intervals thesaurus" https://smartdefine.org/at_irregular_intervals/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, at irregular intervals thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/at_irregular_intervals/thesaurus/synonyms>.
MLASmart Define. "at irregular intervals thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/at_irregular_intervals/thesaurus/synonyms>