54 entries under difficult topic. ×

14
hard(adjective, mean, strong, tough, severe)
14
severe(adjective, person, mean, strong, hard)
12
merciless(adjective, mean, severe, rough)
7
exacting(adjective, tough, severe, rough, firm)
6
demanding(adjective, tough, rough, harsh)
6
rigorous(adjective, strong, hard, tough, severe)
4
rough(adjective, strong, hard, tough)
2
burdensome(adjective, tough, rough, harsh)
2
grinding(adjective, tough, rough, harsh)
2
laborious(adjective, tough, rough, heavy)
2
rugged(adjective, strong, hard, tough, severe)
2
strenuous(adjective, tough, rough, harsh)
1
arduous(adjective, tough, rough, harsh)
1
backbreaking(adjective, tough, rough, heavy)
1
complicated(adjective, tough, rough, heavy)
1
difficile(adjective, tough, rough, heavy)
1
distressing(adjective, tough, severe, rough)
1
effortful(adjective, tough, rough, harsh)
1
fatiguing(adjective, tough, rough, heavy)
1
hairy(adjective, tough, rough, heavy)
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APASmart Define. (2016). unsparing thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unsparing/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsparing thesaurus" https://smartdefine.org/unsparing/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, unsparing thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unsparing/thesaurus/synonyms>.
MLASmart Define. "unsparing thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/unsparing/thesaurus/synonyms>