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Entry 3 senses Webster, 1913

Breathless

/(brĕth"lĕs)/ · Breath·less · IPA /ˈbɹɛθləs/
01 a. Spent with labor or violent action; out of breath.
  1. 1.
    Spent with labor or violent action; out of breath.
  2. 2.
    Not breathing; holding the breath, on account of fear, expectation, or intense interest; attended with a holding of the breath; as, breathless attention.
    “But breathless, as we grow when feeling most.” Byron.
  3. 3.
    Dead; as, a breathless body.