13
gross(adjective, rough, poor, nasty, informal)
13
deplorable(adjective, sad, unhappy, awful, terrible)
13
direful(adjective, awful, terrible, fear, horrible)
13
fearsome(adjective, awful, wonderful, fear, grand)
13
flagitious(adjective, awful, terrible, horrible, afraid)
13
severe(adjective, wicked, painful, sickness, ache)
12
cruel(adjective, evil, sad, unhappy, unpleasant)
12
distressing(adjective, wicked, horrible, painful, sickness)
12
excruciating(adjective, painful, sickness, ache, endured)
12
fiendish(adjective, wicked)
12
iniquitous(adjective, wicked)
12
lousy(adjective, evil, rough, poor, sad)
12
shameful(adjective, severe, dislike, unpleasant, awful)
12
vicious(adjective, evil, unpleasant, awful, terrible)
11
agonizing(adjective, painful, sickness, ache, endured)
11
creepy(adjective, evil, nasty, informal, dislike)
11
extreme(adjective, painful, sickness, ache, endured)
11
sad(adjective, awful, terrible, horrible, afraid)
11
terrific(adjective, great, tough, pain, intense)
10
despicable(verb, adjective, person, mean, offensive)
10 years ago|30k views|share |citing 
APASmart Define. (2016). dreadful thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/dreadful/thesaurus/synonyms
ChicagoSmart Define. 2016. "dreadful thesaurus" https://smartdefine.org/dreadful/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, dreadful thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/dreadful/thesaurus/synonyms>.
MLASmart Define. "dreadful thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/dreadful/thesaurus/synonyms>