ataxia (n.) Look up ataxia at Dictionary.com
also Englished as ataxy, "irregularity of bodily functions," 1610s, "confusion, disorder," medical Latin, from Greek ataxia, from a- "not, without" (see a- (3)) + taxis "arrangement, order," from stem of tassein "to arrange" (see tactics). Pathological sense is attested from 1660s.