Atony

noun

1. Lack of normal muscle tone.
2. Lack of accent or stress.
3. In pathology, a want of tone; defect of muscular power; weakness of any organ, particularly of one that is contractile; debility.
4. Want of tone; weakness of the system, or of any organ, especially of such as are contractile.
5. Lack of muscle tone; flaccidity or atonia