66 entries under hard topic. ×

1
bewildering(adjective, obscure, difficult, sophisticated)
1
byzantine(adjective, fancy, obscure, difficult)
1
can of worms(expression, adjective, idiom, fancy)
1
confounding(adjective, tricky, complicated)
1
confusing(adjective, uncertain, vague, unclear)
1
elaborate(adjective, fancy, difficult, complex)
1
enigmatical(adjective, obscure, strange, uncertain)
1
fancy(adjective, difficult, complex, sophisticated)
1
gasser(adjective, fancy, difficult, complex)
1
hi-tech(adjective, fancy, difficult, complex)
1
interlaced(adjective, fancy, difficult, complex)
1
loose(tricky, complicated, unintelligibility)
1
meandering(obscure, sophisticated, tricky, complicated)
1
mega factor(expression, adjective, fancy, difficult)
1
mixed(adjective, fancy, obscure, difficult)
1
paradoxical(obscure, sophisticated, tricky, complicated)
1
problematical(adjective, difficult, delicate, loose)
1
rambling(obscure, sophisticated, tricky, complicated)
1
sophisticated(adjective, fancy, obscure, difficult)
1
troublesome(adjective, fancy, difficult, delicate)
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APASmart Define. (2015). abstruse thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/abstruse/thesaurus/synonyms
ChicagoSmart Define. 2015. "abstruse thesaurus" https://smartdefine.org/abstruse/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, abstruse thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/abstruse/thesaurus/synonyms>.
MLASmart Define. "abstruse thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/abstruse/thesaurus/synonyms>