39 entries under challenge topic. ×

48
enigma(noun, trouble, show, dispute, difficulty)
42
riddle(noun, trouble, show, difficulty)
40
conundrum(noun, trouble, show, difficulty)
29
puzzle(noun, trouble, show, dispute, difficulty)
27
problem(noun, trouble, difficulty, issue)
26
secret(noun, adjective, trouble, secret)
21
closed book(noun, expression, idiom, trouble)
20
brain-teaser(noun, trouble, puzzle)
16
poser(noun, trouble, difficulty, question)
15
question(noun, trouble, issue, doubt)
13
mystification(noun, trouble, secret, puzzle)
11
puzzlement(noun, trouble, secret, puzzle)
11
secrecy(noun, difficulty, dark, question)
9
why(noun, trouble, difficulty, reason, informal)
9
dilemma(noun, trouble, question, puzzle)
8
paradox(noun, trouble, problem, puzzle)
6
difficulty(noun, trouble, issue, question)
6
crux(noun, trouble, difficulty, question)
5
brainteaser(noun, difficulty, question, secret)
5
puzzler(noun, show, difficulty, question)
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APASmart Define. (2016). mystery thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/mystery/thesaurus/synonyms
ChicagoSmart Define. 2016. "mystery thesaurus" https://smartdefine.org/mystery/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, mystery thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/mystery/thesaurus/synonyms>.
MLASmart Define. "mystery thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/mystery/thesaurus/synonyms>