90 entries under severe topic. ×

78
hard(adjective, dull, great, tough, easy)
61
arduous(adjective, dull, hard, great, tough)
60
tough(adjective, dull, hard, great, easy)
47
laborious(adjective, dull, hard, great, tough)
45
burdensome(adjective, dull, hard, tough)
36
troublesome(adjective, hard, tough, evil)
36
rough(adjective, hard, great, tough)
34
trying(adjective, dull, hard, tough)
28
rugged(adjective, hard, evil, rough)
26
oppressive(adjective, dull, hard, tough)
25
operose(adjective, hard, tough, difficulty)
24
demanding(adjective, dull, hard, tough)
19
onerous(adjective, dull, hard, great, tough)
19
grave(adjective, hard, tough, harsh)
18
strenuous(adjective, dull, hard, great, tough)
16
exacting(adjective, dull, hard, tough)
14
formidable(adjective, hard, tough, evil)
14
heavy(adjective, dull, hard, tough)
11
distressing(adjective, rough, harsh, tender)
11
rigorous(adjective, hard, rough, harsh)
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APASmart Define. (2016). difficult thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/difficult/thesaurus/synonyms
ChicagoSmart Define. 2016. "difficult thesaurus" https://smartdefine.org/difficult/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, difficult thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/difficult/thesaurus/synonyms>.
MLASmart Define. "difficult thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/difficult/thesaurus/synonyms>