adj

• (usually not comparable) No longer living; deceased. (Also used as a noun.)
  "All of my grandparents are dead."
• (usually not comparable) Devoid of living things; barren.
  "a dead planet"
• (hyperbolic) Figuratively, not alive; lacking life.
  "When a man's verses cannot be understood, nor a man's good wit seconded with the forward child, understanding, it strikes a man more dead than a great reckoning in a little room."
• (of another person) So hated or offensive as to be absolutely shunned, ignored, or ostracized.
  "He is dead to me."

adv

• (degree, informal, colloquial) Exactly.
  "dead right; dead level; dead flat; dead straight; dead left"
• (degree, informal, colloquial) Very, absolutely, extremely.
  "dead wrong; dead set; dead serious; dead drunk; dead broke; dead earnest; dead certain; dead slow; dead sure; dead simple; dead honest; dead accurate; dead easy; dead scared; dead solid; dead black; dead white; dead empty"
• (informal) As if dead.
  "dead tired; dead quiet; dead asleep; dead pale; dead cold; dead still"

noun

• (often with "the") Time when coldness, darkness, or stillness is most intense.
  "Near-synonym: nadir"
• (with "the") Those who have died: dead people.
  "the quick and the dead"

noun

• (UK) (usually in the plural) Sterile mining waste, often present as many large rocks stacked inside the workings.
• (bodybuilding, colloquial) Clipping of deadlift.