54 entries under problematical topic. ×

19
toilful(adjective, hard, difficult, complex, awkward)
18
wearisome(adjective, dull, hard, tough, difficult)
17
fatiguing(adjective, dull, hard, difficult, awkward)
16
exhausting(adjective, dull, hard, difficult, awkward)
14
demanding(adjective, dull, hard, tough, severe)
14
heavy(adjective, dull, hard, tough, severe)
14
tiring(adjective, dull, tough, difficult, awkward)
14
troublesome(adjective, hard, tough, severe, difficulty)
14
uphill(adjective, hard, great, tough, easy)
13
formidable(adjective, tough, severe, difficulty, rough)
12
wearying(adjective, dull, difficult, awkward, boring)
11
exacting(adjective, dull, hard, tough, severe)
10
grueling(adjective, hard, tough, severe, difficult)
8
effortful(adjective, hard, great, tough, rough)
8
wearing(adjective, dull, hard, difficult, awkward)
7
labored(adjective, hard, great, tough, rough)
6
Herculean(adjective, strong, hard, tough, severe)
6
rigorous(adjective, hard, tough, severe, rough)
4
irksome(adjective, dull, difficulty, difficult, awkward)
3
awkward(adjective, difficult, heavy, demanding, weighty)
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APASmart Define. (2016). laborious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/laborious/thesaurus/synonyms
ChicagoSmart Define. 2016. "laborious thesaurus" https://smartdefine.org/laborious/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, laborious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/laborious/thesaurus/synonyms>.
MLASmart Define. "laborious thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/laborious/thesaurus/synonyms>