72 entries under rare topic. ×

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unconventional(unusual, special)
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uncustomary(adjective, unusual, special, scarce)
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unfamiliar(unusual, special)
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unimaginable(light, thin, unusual, special)
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unorthodox(unusual, special)
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unparalleled(unusual, special)
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unprecedented(unusual, special)
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unthinkable(light, thin, unusual, special)
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unwonted(light, thin, unusual, special)
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very different(expression, unusual, special)
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wanting(adjective, inadequate, limited, insufficient)
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weird(unusual, special)
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APASmart Define. (2015). seldom thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/seldom/thesaurus/synonyms
ChicagoSmart Define. 2015. "seldom thesaurus" https://smartdefine.org/seldom/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, seldom thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/seldom/thesaurus/synonyms>.
MLASmart Define. "seldom thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/seldom/thesaurus/synonyms>