4 entries under rarely topic. ×

10
sometimes(expression, adverb, time, moment, rare)
6
infrequently(expression, adverb, time, moment, rare)
5
irregularly(adverb, vacillating, infrequently, intermittently)
4
sporadically(expression, adverb, time, rare, vacillating)
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APASmart Define. (2013). once in a while thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/once_in_a_while/thesaurus/synonyms
ChicagoSmart Define. 2013. "once in a while thesaurus" https://smartdefine.org/once_in_a_while/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2013, once in a while thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/once_in_a_while/thesaurus/synonyms>.
MLASmart Define. "once in a while thesaurus" 18 May 2013. Web. 26 September 2026. <https://smartdefine.org/once_in_a_while/thesaurus/synonyms>