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loss of coordination of the muscles, especially of the extremities.
Historical Examples

With these methods, needing not more than twenty minutes three times a day, the ataxic symptoms sometimes rapidly diminish.
Fat and Blood S. Weir Mitchell

There are three stages: The preataxic, the ataxic, the bed-ridden paralytic.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 7 Various

I was astonished at his conduct, and still cannot understand what end he imagined would be served by this ataxic defiance.
The Last Miracle M. P. Shiel

In the ataxo-adynamic form the symptoms of the ataxic and those of the adynamic form are found united.
A System of Practical Medicine by American Authors, Vol. I Various

All cases, however, if they live long enough, pass into the second ataxic stage.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 7 Various

There may also be ataxic symptoms, paretic weakness of bowel and bladder, trembling and spasms.
Degeneracy Eugene S. Talbot

The ataxic patient needs consolation, and this can be given without in any way deceiving him.
Psychotherapy James J. Walsh

noun
(pathol) lack of muscular coordination
adj.

1853, from ataxia + -ic.
n.

also anglicized as ataxy, “irregularity of bodily functions,” 1610s, “confusion, disorder,” medical Latin, from Greek ataxia, from a-, privative prefix, + taxis “arrangement, order,” from stem of tassein “to arrange” (see tactics). Pathological sense is attested from 1660s.

ataxic a·tax·ic (ə-tāk’sĭk) or a·tac·tic (ə-tāk’tĭk)
adj.
Of, relating to, or characterized by ataxia.

ataxia a·tax·i·a (ə-tāk’sē-ə) or a·tax·y (ə-tāk’sē)
n.
Loss of the ability to coordinate muscular movement. Also called dyssynergia, incoordination.
ataxia
(ə-tāk’sē-ə)
Loss of muscular coordination as a result of damage to the central nervous system.