92 entries under hard topic. ×

5
wearing(adjective, dull, tough, difficult)
4
bothersome(adjective, tough, severe, difficult)
4
challenging(adjective, great, tough, severe)
3
fussy(adjective, tough, difficult, problematic)
3
tiresome(adjective, tough, severe, difficult)
2
abstruse(adjective, fancy, difficult, complex)
2
hairy(adjective, severe, rough, difficult)
2
mean(adjective, severe, rough, difficult)
2
stern(adjective, severe, rough, difficult)
1
Daedalean(adjective, fancy, difficult, complex)
1
backbreaker(tough, severe, difficult, painful)
1
can of worms(expression, adjective, idiom, fancy)
1
convoluted(adjective, fancy, difficult, complex)
1
entangled(adjective, fancy, difficult, complex)
1
fancy(adjective, difficult, complex, intricate)
1
gasser(adjective, fancy, difficult, complex)
1
hi-tech(adjective, fancy, difficult, complex)
1
interlaced(adjective, fancy, difficult, complex)
1
mega factor(expression, adjective, fancy, difficult)
1
mixed(adjective, fancy, difficult, complex)
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APASmart Define. (2016). arduous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/arduous/thesaurus/synonyms
ChicagoSmart Define. 2016. "arduous thesaurus" https://smartdefine.org/arduous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, arduous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/arduous/thesaurus/synonyms>.
MLASmart Define. "arduous thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/arduous/thesaurus/synonyms>