Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nullā-tĕnus [cf. eā-tenus, etc.], adv., in nowise, by no means (post-class.): immortalitatis sedem nullatenus obtinebis, Mart. Cap. 2, § 135; Cod. Just. 8, 10, 12, § 3.