Dyssynergia is a medical condition that refers to a lack of coordination in the muscles that control movement. There are several synonyms for this condition, including ataxia, dyscoordination, and apraxia. Ataxia is a disorder of the nervous system that causes problems with movement, balance, and coordination. Dyscoordination is another term used to describe a lack of coordination. Apraxia refers to a condition in which a person has difficulty performing specific actions or movements. These synonyms all reflect the impaired coordination and control of movement that is characteristic of dyssynergia, which can result from a range of underlying neurological conditions.