Source : Webster's Revised Unabridged Dictionary (1913)

Pulseless \Pulse"less\, a.
   Having no pulsation; lifeless.

Source : WordNet®

pulseless
     adj : appearing dead; not breathing or having no perceptible
           pulse; "an inanimate body"; "pulseless and dead" [syn:
           {breathless}, {inanimate}]