100 entries under adjective topic. ×

34
unexpected(great, excellent, shock, violent)
27
unanticipated(adverb, great, excellent, superb)
17
accidental(chance, shocking, astonishing, intention)
15
fortuitous(chance, shocking, astonishing, intention)
15
sudden(extraordinary, wonderful, quick, abrupt)
15
unpredicted(adverb, great, excellent, superb)
14
abrupt(violent, fast, quick, heedless)
14
unlooked-for(secret, unexpected, surprising, unanticipated)
12
extraordinary(great, excellent, superb, super)
12
startling(great, excellent, superb, super)
11
chance(shocking, astonishing, astounding, unintentional)
11
surprising(adverb, wonderful, quick, abrupt)
11
unplanned(chance, lucky, unintentional, accidental)
10
casual(chance, random, liable, unintentional)
9
adventitious(chance, unplanned, unintentional, accidental)
8
unannounced
8
hasty(violent, fast, quick, abrupt)
8
out of the blue(adverb, surprising, unpredicted)
8
quick(violent, fast, abrupt, hasty)
8
surprise(noun, state, shock, amazing)
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APASmart Define. (2015). unforeseen thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unforeseen/thesaurus/synonyms
ChicagoSmart Define. 2015. "unforeseen thesaurus" https://smartdefine.org/unforeseen/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unforeseen thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unforeseen/thesaurus/synonyms>.
MLASmart Define. "unforeseen thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/unforeseen/thesaurus/synonyms>