deadly

Adverb
  1. As if dead (synset 400306284)
    same as: lifelessly
  2. (used as intensives) extremely (synset 400047177)
    "she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous"
    domain usage: intensifier, intensive - a modifier that has little meaning except to intensify the meaning it modifies
    same as: deucedly, devilishly, insanely, madly
Adjective
  1. Causing or capable of causing death (synset 300997017)
    "a fatal accident"; "a deadly enemy"; "mortal combat"; "a mortal illness"
    similar to: fatal - bringing death
    same as: deathly, mortal
  2. Of an instrument of certain death (synset 300997235)
    "deadly poisons"; "lethal weapon"; "a lethal injection"
    similar to: fatal - bringing death
    same as: lethal
  3. Extremely poisonous or injurious;
    Producing venom (synset 302459025)
    "venomous snakes"; "a virulent insect bite"
    similar to: toxic - of or relating to or caused by a toxin or poison
    same as: venomous, virulent
  4. Involving loss of divine grace or spiritual death (synset 301725926)
    "the seven deadly sins"
    referred to in: divinity, theology - the rational and systematic study of religion and its influences and of the nature of religious truth
    similar to: unpardonable - not admitting of pardon
    same as: mortal
  5. Exceedingly harmful (synset 301615857)
    similar to: noxious - injurious to physical or mental health
    same as: baneful, pernicious, pestilent
  6. (of a disease) having a rapid course and violent effect (synset 300046108)
    similar to: virulent - infectious; having the ability to cause disease

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