Synonyms|96Antonyms|1|Broader|0Narrower|0Related|0

37 entries under difficulty topic. ×

2
closed book(expression, question, secret, puzzle)
2
cryptogram(question, secret, puzzle, knot)
2
enigma(noun, question, problem, secret)
2
perplexity(noun, question, secret, puzzle)
2
problem(question, secret, puzzle, knot)
2
sixty-four-thousand-dollar question(expression, question, secret, puzzle)
2
sphinx(question, secret, puzzle, knot)
2
stickler(question, secret, puzzle, knot)
2
stumper(question, secret, puzzle, knot)
2
teaser(question, secret, puzzle, knot)
2
twister(question, secret, puzzle, knot)
1
abstruseness(question, secret, puzzle, perplexity)
1
brainteaser(question, secret, puzzle, perplexity)
1
braintwister(question, secret, puzzle, perplexity)
1
charade(question, secret, puzzle, obscurity)
1
chiller(question, secret, puzzle, obscurity)
1
cliffhanger(question, secret, puzzle, knot)
1
crux(question, secret, puzzle, knot)
1
grabber(question, secret, puzzle, knot)
1
inscrutability(question, secret, puzzle, perplexity)
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APASmart Define. (2011). tough nut to crack thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms
ChicagoSmart Define. 2011. "tough nut to crack thesaurus" https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>.
MLASmart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 28 September 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>