deathly

The definition of deathly is something that is related to or likely to cause death.

(adjective)

A person who is extremely ill and likely to die is an example of someone who would be described as deathly ill.

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See deathly in Webster's New World College Dictionary

adjective

  1. causing death; deadly
  2. like or characteristic of death

Origin: ME dethlich < OE dēathlic: see death

adverb

  1. in a deathlike way; to a deadly degree
  2. extremely: deathly ill

See deathly in American Heritage Dictionary 4

adjective
  1. Of, resembling, or characteristic of death: a deathly silence.
  2. Causing death; fatal.
adverb
  1. In the manner of death.
  2. Extremely; very: The night was deathly cold.

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