120 entries under noun topic. ×

4
difficult question(trouble, challenge, question, puzzle)
4
discord(verb, difficult, issue, think)
4
inconsistency(difficult, issue, question, absurdity)
4
knot(informal, question, secret, dilemma)
4
nonsense(difficult, issue, question, absurdity)
4
open question(expression, idiom, question, secret)
4
parable(question, secret, dilemma, mystery)
4
plain question(expression, idiom, question, secret)
4
point in dispute(expression, idiom, question, secret)
4
question at issue(expression, idiom, question, secret)
4
screen(verb, difficult, issue, think)
4
sealed book(expression, idiom, problem, secret)
4
sixty-four dollar question(expression, idiom, question, secret)
4
subject of controversy(expression, idiom, question, secret)
4
subject of inquiry(expression, idiom, question, secret)
3
Gordian knot(question, secret, dilemma, mystery)
3
baffle(verb, difficult, issue, think)
3
bother(verb, difficult, issue, think)
3
confidence(difficult, issue, question, task)
3
confusion(difficult, issue, question, puzzle)
10 years ago|27k views|share |citing 
APASmart Define. (2016). enigma thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/enigma/thesaurus/synonyms
ChicagoSmart Define. 2016. "enigma thesaurus" https://smartdefine.org/enigma/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, enigma thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/enigma/thesaurus/synonyms>.
MLASmart Define. "enigma thesaurus" 1 April 2016. Web. 29 September 2026. <https://smartdefine.org/enigma/thesaurus/synonyms>