Synonyms|768Antonyms|230|Broader|9Narrower|0Related|1.3k

104 entries under difficult topic. ×

8
toilsome(adjective, tough, severe, difficulty)
8
uphill(adjective, tough, severe, rough)
7
demanding(adjective, tough, severe, rough)
7
effortful(adjective, tough, severe, heavy)
7
great(adjective, tough, big, large)
6
rugged(adjective, hard, severe, evil, rough)
6
staggering(adjective, overwhelming)
6
challenging(adjective, tough, severe, awkward)
6
knotty(adjective, hard, severe, rough)
6
operose(adjective, tough, severe, difficulty, rough)
6
serious(adjective, bad, hard, unpleasant)
6
thorny(adjective, bad, delicate, complex)
6
trying(adjective, tough, severe, rough)
5
all-powerful(adjective, tough, overwhelming, prevailing)
5
complex(adjective, hard, delicate, heavy)
5
dismaying(adjective, horrible, overwhelming, terrifying)
5
exacting(adjective, tough, severe, rough)
5
harsh(adjective, hard, great, severe, rough)
5
indomitable(adjective, overwhelming)
5
labored(adjective, tough, severe, heavy)
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HarvardSmart Define 2015, formidable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/formidable/thesaurus/synonyms>.
MLASmart Define. "formidable thesaurus" 17 July 2015. Web. 20 September 2026. <https://smartdefine.org/formidable/thesaurus/synonyms>