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Adjective: deadly (deadlier,deadliest)  ded-lee
  1. Causing or capable of causing death
    "a deadly enemy";
    - deathly, mortal
     
  2. Of an instrument of certain death
    "deadly poisons";
    - lethal
     
  3. Extremely poisonous or injurious; producing venom
    "deadly snakes";
    - venomous, virulent
     
  4. (theology) involving loss of divine grace or spiritual death
    "the seven deadly sins";
    - mortal
     
  5. Exceedingly harmful
    - baneful, pernicious, pestilent
     
  6. (of a disease) having a rapid course and violent effect
     
  7. So lacking in interest as to cause mental weariness
    - boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome, unamusing, draggy, mind-numbing
Adverb: deadly  ded-lee
  1. As if dead
    - lifelessly
     
  2. (used to intensify) extremely
    "deadly dull"; "deadly earnest";
    - madly, insanely, deucedly, devilishly

Derived forms: deadliest, deadlier

See also: fatal, irremissible, lame, lameo [informal], meh [informal], noxious, samey [Brit], toxic, uninspiring, uninteresting, unpardonable, virulent

Encyclopedia: Deadly, Unna?