37 entries under hard topic. ×

34
tough(adjective, feature, characteristic, difficult)
30
tricky(adjective, easy, difficult, delicate)
29
difficult(adjective, delicate, complex, awkward)
28
oppressive(adjective, moist, close, difficult)
26
knotty(adjective, difficult, delicate, informal)
26
thorny(adjective, difficult, complex, problematic)
25
nasty(adjective, difficult, terrible, dirty)
25
rough(adjective, easy, difficult, complex)
24
sensitive(adjective, difficult, delicate, complex)
24
tight(adjective, easy, difficult, complex)
24
trying(adjective, difficult, complex)
23
laborious(adjective, difficult, complex, awkward)
23
rugged(adjective, difficult, complex, awkward)
22
complicated(adjective, difficult, delicate, complex)
22
painful(adjective, difficult, complex, embarrassing)
21
complex(adjective, difficult)
21
operose(adjective, difficult, complex, awkward)
21
precarious(adjective, difficult, complex)
21
problematic(adjective, difficult, complex)
20
intricate(adjective, difficult, delicate, complex)
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APASmart Define. (2016). sticky thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/sticky/thesaurus/synonyms
ChicagoSmart Define. 2016. "sticky thesaurus" https://smartdefine.org/sticky/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, sticky thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/sticky/thesaurus/synonyms>.
MLASmart Define. "sticky thesaurus" 2 March 2016. Web. 26 September 2026. <https://smartdefine.org/sticky/thesaurus/synonyms>