6
acute(adjective, painful, endured)
6
agonizing(adjective, painful, endured)
6
excruciating(adjective, painful, endured)
6
creepy(adjective, bad, awful, disgusting, sinful)
6
distasteful(adjective, endured)
6
flagitious(adjective, awful, terrible, horrible, afraid)
6
flagrant(adjective, awful, terrible, horrible, afraid)
6
formidable(adjective, bad, awful, terrible, shocking)
6
grotesque
6
noxious(adjective, endured)
6
sinister(adjective, bad, awful, disgusting, sinful)
6
unpleasant(adjective, tough, severe, nasty, intense)
5
dark
5
disagreeable(adjective, nasty, unpleasant, awful, terrible)
5
disastrous(adjective, terrible)
5
grueling(adjective, awful, terrible, horrible, painful)
5
lousy(adjective, bad, nasty, offensive, unpleasant)
5
redoubtable(adjective, awful, terrible, dreadful)
5
sick(adjective, bad, awful, disgusting, sinful)
5
ugly
11 years ago|10k views|share |citing 
APASmart Define. (2015). horrendous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/horrendous/thesaurus/synonyms
ChicagoSmart Define. 2015. "horrendous thesaurus" https://smartdefine.org/horrendous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, horrendous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/horrendous/thesaurus/synonyms>.
MLASmart Define. "horrendous thesaurus" 17 July 2015. Web. 25 September 2026. <https://smartdefine.org/horrendous/thesaurus/synonyms>