28 entries under unplanned topic. ×

9
casual(adjective, chance, random, lucky)
7
random(adjective, chance, lucky, accidental)
7
accidental(adjective, chance, lucky, unpremeditated)
7
chance(adjective, lucky, accidental, unpremeditated)
6
adventitious(adjective, happy, chance, fortunate, opportune)
5
incidental(adjective, chance, lucky, accidental)
5
unforeseen(adjective, chance, lucky, accidental)
4
unexpected(adjective, chance, unpremeditated)
2
unpremeditated(adjective, chance)
1
contingent(chance, lucky, accidental, unpremeditated)
1
fluky(adjective, chance, fortunate, lucky)
1
occasional(adjective, chance, unpremeditated)
1
odd(chance, lucky, accidental, unpremeditated)
1
uncertain(adjective, chance, unpremeditated)
1
unintended(adjective, chance, unpremeditated)
1
unintentional(adjective, chance, unpremeditated)
0
by chance(expression, chance, unpremeditated)
0
erratic(chance, unpremeditated)
0
extemporaneous(chance, unpremeditated)
0
extempore(chance, unpremeditated)
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APASmart Define. (2015). serendipitous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serendipitous/thesaurus/synonyms
ChicagoSmart Define. 2015. "serendipitous thesaurus" https://smartdefine.org/serendipitous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, serendipitous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serendipitous/thesaurus/synonyms>.
MLASmart Define. "serendipitous thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/serendipitous/thesaurus/synonyms>