Hotel pool to fill that one club's rather wasted?

• Fixer to note: this is lacking muscle tone
• Tiny pooch suffering, lacking muscle tone
• Low in tension, as muscles

WordNet Word definitions in WordNet
adj. (of living tissue) lacking normal tone or tension [ant: hypertonic ] (of a solution) having a lower osmotic pressure than a comparison solution [ant: isotonic , hypertonic ]

Wiktionary Word definitions in Wiktionary
a. 1 (context of a solution English) Having a lower osmotic pressure than another. 2 (context medicine English) Showing less than normal tension in the muscles or muscle tissue.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1873, from hypo- + tonic .