Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not subject to death; immortal.
  • adj. Unable to be killed, quenched, or terminated; eternal; everlasting.
  • adj. Of or pertaining to the undead.
  • adv. Immortally; eternally.
  • adj. Not deadly; not causing, producing, or resulting in death; harmless.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not subject to death; immortal.

from The Century Dictionary and Cyclopedia

  • Not subject to death; immortal.

Etymologies

From Middle English undeedlii, vndeedly, undedlich, from Old English undēadlīc ("immortal, for all eternity"), equivalent to undead +‎ -ly. (Wiktionary)
From un- +‎ deadly. (Wiktionary)

Examples

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