4
gastful(adjective, awful, terrible, horrible, afraid)
4
ghastful(adjective, awful, terrible, horrible, afraid)
4
ghostlike(adjective, live, ghastly, gaunt, skeletal)
4
ghoulish(adjective, strange, horrible, horror, scary)
4
god awful(adjective, awful, terrible, horrible, afraid)
4
grave(adjective, dangerous, crucial)
4
grievous(adjective, awful, terrible, horrible, afraid)
4
humdrum(adjective, dull, dry, boring, tedious)
4
inhuman
4
insanely
4
life-threatening(adjective, dangerous)
4
malign
4
pestiferous(adjective, bad, evil, harmful, injurious)
4
septic(adjective, unhealthy)
4
toxicant(adjective, poisonous)
4
white
3
abominable(adjective, awful, terrible, horrible, afraid)
3
abysmal(adjective, awful, terrible, horrible, afraid)
3
almighty(adjective, awful, terrible, horrible, afraid)
3
ashen(adjective, boring, tedious, gaunt, skeletal)
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APASmart Define. (2016). deadly thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/deadly/thesaurus/synonyms
ChicagoSmart Define. 2016. "deadly thesaurus" https://smartdefine.org/deadly/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, deadly thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/deadly/thesaurus/synonyms>.
MLASmart Define. "deadly thesaurus" 26 March 2016. Web. 23 September 2026. <https://smartdefine.org/deadly/thesaurus/synonyms>