Synonyms|1kAntonyms|253|Broader|5Narrower|1Related|546

75 entries under demanding topic. ×

2
hairy(adjective, tough, severe, rough, difficult)
2
knotty(adjective, tough, severe, rough, difficult)
2
merciless(adjective, hard, tough, difficult, harsh)
2
operose(adjective, hard, tough, severe, rough)
2
picky(adjective, tough, severe, fine, firm)
2
tricky(adjective, difficult, awkward, grueling)
2
troublesome(adjective, hard, tough, severe, rough)
1
backbreaking(adjective, hard, tough, severe, rough)
1
by the book(expression, adjective, idiom, strong, hard)
1
complicated(adjective, tough, rough, difficult, heavy)
1
distressing(adjective, tough, severe, rough, difficult)
1
fatiguing(adjective, hard, tough, severe, rough)
1
grievous(adjective, hard, tough, severe, harsh)
1
grueling(adjective, hard, tough, severe, difficult)
1
involved(adjective, tough, rough, difficult, heavy)
1
irksome(adjective, tough, severe, rough, difficult)
1
labored(adjective, hard, tough, rough, difficult)
1
murder(adjective, hard, tough, severe, rough)
1
scabrous(adjective, tough, rough, difficult, heavy)
1
serious(adjective, strong, hard, tough, severe)
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APASmart Define. (2016). rigorous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>