63 entries under adjective topic. ×

10
fortuitous(happy, chance, fortunate, opportune)
9
casual(chance, random, lucky, unplanned)
7
random(chance, lucky, unplanned, accidental)
7
accidental(chance, lucky, unplanned, unpremeditated)
7
chance(lucky, unplanned, accidental, unpremeditated)
6
adventitious(happy, chance, fortunate, opportune)
6
lucky(fortunate, opportune, blessed, accidental)
5
incidental(chance, lucky, unplanned, accidental)
5
unforeseen(chance, lucky, unplanned, accidental)
4
unexpected(chance, unplanned, unpremeditated)
4
unplanned(chance, lucky, accidental, unpremeditated)
3
aleatory
3
favorable(useful, beneficial, advantageous)
3
haphazard
3
symbiotic(useful, beneficial, advantageous)
2
unpremeditated(chance, unplanned)
2
arbitrary
2
opportune(happy, fortunate, blessed, fluky)
2
propitious(happy, fortunate, opportune, blessed)
2
unpredictable
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APASmart Define. (2015). serendipitous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serendipitous/thesaurus/synonyms
ChicagoSmart Define. 2015. "serendipitous thesaurus" https://smartdefine.org/serendipitous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, serendipitous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serendipitous/thesaurus/synonyms>.
MLASmart Define. "serendipitous thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/serendipitous/thesaurus/synonyms>