4
catastrophic(adjective, sad, unhappy, awful, terrible)
4
demonic
4
devilish
4
egregious
4
ferocious(adjective, awful, terrible, horrible, afraid)
4
fierce(adjective, great, tough, difficult, awful)
4
grave(adjective, severe, intense, unpleasant, terrible)
4
grewsome(adjective, endured)
4
harsh(adjective, great, huge, endured, massive)
4
hateful(adjective, mean, severe, nasty, offensive)
4
immoral(adjective, wicked)
4
indecent(adjective, dislike, wicked, horrible, ugly)
4
malicious(adjective, wicked)
4
mortal(adjective, awful, terrible, horrible, afraid)
4
noisome(adjective, offensive, unpleasant, terrible, vicious)
4
pitiful(adjective, sad, unhappy, awful, terrible)
4
regrettable(adjective, wrong, unfortunate)
4
reprehensible(adjective, evil, nasty, offensive, unpleasant)
4
saddening(adjective, sickness, ache, anguishes)
4
sick(horrible, ill, ugly, revolting, repulsive)
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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>