Want of tone; weakness of the system, or of any organ, especially of such as are contractile.

A state in which muscles are floppy, lacking their normal elasticity. Many possible causes. Muscles are floppy, lacking their normal elasticity.

lack of normal muscular tension or tonus

A lack of muscle tone, usually leading to temporary debilitation.

In botany, lack of muscle tone of the supportive musculature of the bladder sphincter, resulting in incontinence.