adjective. Of or relating to a polymer lacking structural regularity.

Disconnected; without arrangement or order: in grammar, opposed to syntactic: as, an atactic sentence.

Same as ataxic.

adjective. Of or pertaining to ataxia

adjective. Describing any regular polymer or other macromolecule in which the orientation of the subunits is random

adjective. lacking motor coordination; marked or caused by ataxia

"Prof. Natta extended the research conducted by Ziegler on organometallic catalysts to the stereospecific polymerization, thus discovering new classes of polymers with a sterically ordered structure, viz. isotactic, syndiotactic and di-isotactic polymers and linear non branched olefinic polymers and copolymers with an atactic (or sterically nonordered) structure."