atactic
/əˈtæktɪk/adjective
- Chemistry (of a polymer or polymer structure) in which the repeating units have no regular stereochemical configuration【化】（聚合物, 聚合物结构）无规（立构）的, 共济失调的。
词源
mid 19th cent.: from Greek ataktos, from a- 'not' + taktos 'arranged' + -IC.