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25 entries under perplexity topic. ×

1
abstruseness(difficulty, question, secret, puzzle)
1
brainteaser(difficulty, question, secret, puzzle)
1
braintwister(difficulty, question, secret, puzzle)
1
inscrutability(difficulty, question, secret, puzzle)
1
inscrutableness(difficulty, question, secret, puzzle)
1
mindboggler(difficulty, question, secret, puzzle)
1
occult(difficulty, question, secret, puzzle)
1
puzzler(difficulty, question, problem, puzzle)
1
rebus(difficulty, question, secret, puzzle)
1
rune(difficulty, question, secret, puzzle)
1
thriller(difficulty, question, secret, puzzle)
1
whodunit(difficulty, question, secret, puzzle)
0
bewitchment(abstruseness, inscrutableness)
0
confidential information(expression, abstruseness, inscrutableness)
0
hocuspocus(abstruseness, inscrutableness)
0
magic number(expression, abstruseness, inscrutableness)
0
occultism(abstruseness, inscrutableness)
0
privileged information(expression, abstruseness, inscrutableness)
0
runes(abstruseness, inscrutableness)
0
skeleton in cupboard(expression, idiom, abstruseness, inscrutableness)
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APASmart Define. (2011). tough nut to crack thesaurus. Retrieved September 29, 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 29, 2026).
HarvardSmart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>.
MLASmart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 29 September 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>