Ataxic \A*tax"ic\, a. [Cf. F. ataxique. See {Ataxia}.] (Med.) Characterized by ataxy, that is, (a) by great irregularity of functions or symptoms, or (b) by a lack of coordinating power in movements. [1913 Webster] {Ataxic fever}, malignant typhus fever. --Pinel. [1913 Webster]