Synonyms|199Antonyms|23|Broader|0Narrower|0Related|184
3
evil(adjective, endured)
3
excruciating(adjective, endured)
3
extreme(adjective, endured)
3
fearful(adjective, frightening)
3
frightening(adjective, nasty, awful, terrible, unreasonable)
3
grewsome(adjective, endured)
3
harrowing(adjective, endured)
3
harsh(adjective, endured)
3
horrific
3
insufferable(adjective, endured)
3
insupportable(adjective, endured)
3
intense(adjective, endured)
3
intolerable(adjective, endured)
3
loathsome(adjective, endured)
3
nasty(adjective, endured)
3
nightmare(adjective, terrible, frightening, traumatic, terrifying)
3
noxious(adjective, endured)
3
obnoxious(adjective, endured)
3
odious(adjective, endured)
3
offensive(adjective, endured)
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APASmart Define. (2013). nightmarish thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/nightmarish/thesaurus/synonyms
ChicagoSmart Define. 2013. "nightmarish thesaurus" https://smartdefine.org/nightmarish/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2013, nightmarish thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/nightmarish/thesaurus/synonyms>.
MLASmart Define. "nightmarish thesaurus" 28 June 2013. Web. 28 September 2026. <https://smartdefine.org/nightmarish/thesaurus/synonyms>