15 entries under trouble topic. ×

33
conundrum(noun, difficulty, informal, challenge)
29
enigma(noun, challenge, question, puzzle)
28
riddle(noun, challenge, question, puzzle)
18
mystery(noun, challenge, question, puzzle)
14
closed book(noun, expression, challenge, puzzle)
12
secret(noun, challenge, question, puzzle)
9
problem(noun, challenge, question, puzzle)
8
puzzle(noun, challenge, question, mystery)
6
puzzlement(noun, challenge, question, puzzle)
5
poser(noun, challenge, question, puzzle)
4
mystification(noun, challenge, question, puzzle)
4
paradox(noun, challenge, question, puzzle)
3
why(noun, challenge, puzzle)
2
dilemma(noun, challenge, question, puzzle)
1
crux(noun, challenge, puzzle)
10 years ago|1.1k views|share |citing 
APASmart Define. (2016). brain-teaser thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/brain-teaser/thesaurus/synonyms
ChicagoSmart Define. 2016. "brain-teaser thesaurus" https://smartdefine.org/brain-teaser/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, brain-teaser thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/brain-teaser/thesaurus/synonyms>.
MLASmart Define. "brain-teaser thesaurus" 1 April 2016. Web. 26 September 2026. <https://smartdefine.org/brain-teaser/thesaurus/synonyms>