beatlessadj.

/ˈbiːtlɪs/Etymology: < beat n.1 + -less suffix.
the world > life > the body > vascular system > circulation > pulsation > heartbeat > [adjective] > not beating
1849 D. Rock III. viii. 85 That heart is now cold and beatless.
This entry has not yet been fully updated (first published 1887; most recently modified version published online March 2018).