Synonyms|148Antonyms|6|Broader|0Narrower|0Related|41
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impromptu(chance, unplanned, unpremeditated)
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improving(adjective, useful, beneficial, advantageous)
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improvised(chance, unplanned, unpremeditated)
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impulsive(chance, unplanned, unpremeditated)
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inadvertent
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indefinite
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indeterminate
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indiscriminate
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infrequent(chance, unplanned, unpremeditated)
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instrumental(useful, beneficial, advantageous)
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invaluable(useful, beneficial, advantageous)
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irregular(chance, unplanned, unpremeditated)
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jammy(fortunate, blessed, fluky)
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non-specific
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of use(expression, useful, beneficial, advantageous)
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off-the-cuff(chance, unplanned, unpremeditated)
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offhand(chance, unplanned, unpremeditated)
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operative(useful, beneficial, advantageous)
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practical(useful, beneficial, advantageous)
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pragmatic(useful, beneficial, advantageous)
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APASmart Define. (2015). serendipitous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/serendipitous/thesaurus/synonyms
ChicagoSmart Define. 2015. "serendipitous thesaurus" https://smartdefine.org/serendipitous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, serendipitous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/serendipitous/thesaurus/synonyms>.
MLASmart Define. "serendipitous thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/serendipitous/thesaurus/synonyms>