46 entries under hard topic. ×

9
baffling(adjective, delicate, complex, tricky)
8
difficult(adjective, complex, awkward, demanding)
7
knotty(adjective, difficult, delicate, loose)
6
enigmatic(adjective, obscure, uncertainty, uncertain)
5
intricate(adjective, difficult, delicate, loose)
4
perplexing(adjective, difficult, delicate, loose)
4
tricky(adjective, difficult, uncertain, complex)
3
involved(adjective, difficult, delicate, loose)
3
paradoxical(delicate, uncertainty, uncertain, complex)
3
puzzling(adjective, difficult, loose, complex)
2
bewildering(tricky, complicated)
2
complex(adjective, difficult, delicate, loose)
2
confounding(delicate, complex, tricky, complicated)
2
confusing(delicate, complex, tricky, complicated)
2
labyrinthine(adjective, difficult, delicate, loose)
2
mysterious(delicate, uncertain, complex, doubtful)
2
mystifying(delicate, complex, awkward, tricky)
2
obscure(adjective, uncertain, doubtful, dubious)
2
thorny(adjective, difficult, delicate, complex)
2
ticklish(delicate, complex, tricky, complicated)
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APASmart Define. (2015). problematical thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/problematical/thesaurus/synonyms
ChicagoSmart Define. 2015. "problematical thesaurus" https://smartdefine.org/problematical/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, problematical thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/problematical/thesaurus/synonyms>.
MLASmart Define. "problematical thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/problematical/thesaurus/synonyms>