28 entries under unplanned topic. ×

14
occasional(adjective, slight, thin, strange, exceptional)
6
irregular(adjective, excellent, extraordinary, unusual, special)
6
odd(adjective, excellent, extraordinary, unusual, strange)
4
casual(adjective, chance, irregular, erratic, random)
1
erratic(chance, irregular, random, haphazard)
1
incidental(adjective, chance, irregular, unpremeditated)
1
random(adjective, chance, irregular, erratic, haphazard)
0
accidental(chance, unpremeditated)
0
adventitious(chance, unpremeditated)
0
by chance(expression, chance, unpremeditated)
0
chance(adjective, irregular, unpremeditated)
0
contingent(chance, unpremeditated)
0
extemporaneous(chance, unpremeditated)
0
extempore(chance, unpremeditated)
0
fluky(chance, unpremeditated)
0
fortuitous(chance, unpremeditated)
0
impromptu(chance, unpremeditated)
0
improvised(chance, unpremeditated)
0
impulsive(chance, unpremeditated)
0
off-the-cuff(chance, unpremeditated)
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APASmart Define. (2015). infrequent thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/infrequent/thesaurus/synonyms
ChicagoSmart Define. 2015. "infrequent thesaurus" https://smartdefine.org/infrequent/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, infrequent thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/infrequent/thesaurus/synonyms>.
MLASmart Define. "infrequent thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/infrequent/thesaurus/synonyms>