Thayer's Greek Lexicon

 1. properly
  1) one that has breathed his last, lifeless
  2) deceased, departed, one whose soul is in Hades
  3) destitute of life, without life, inanimate
2. metaph.
  1) spiritually dead
2a1. destitute of a life that recognises and is devoted to God,
because given up to trespasses and sins
2a2. inactive as respects doing right
  2) destitute of force or power, inactive, inoperative