Synonyms|199Antonyms|23|Broader|0Narrower|0Related|184
5
alarming(adjective, frightening)
5
disgusting(adjective, endured)
5
hair-raising(adjective, nasty, awful, terrible, unreasonable)
5
heinous(adjective, endured)
5
lurid(adjective, endured)
5
nauseating(adjective, endured)
5
repugnant(adjective, endured)
5
repulsive(adjective, endured)
5
revolting(adjective, endured)
4
foul(adjective, endured)
4
ghoulish(adjective, nasty, awful, terrible, unreasonable)
4
scary(adjective, nasty, awful, terrible, unreasonable)
4
spooky(adjective, frightening)
3
abhorrent(adjective, endured)
3
abominable(adjective, endured)
3
acute(adjective, endured)
3
bad(adjective, endured)
3
cruel(adjective, endured)
3
deplorable(adjective, endured)
3
distasteful(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>