anapodeictic

from The Collaborative International Dictionary of English v.0.48

Anapodeictic \An*ap`o*deic"tic\, a. [Gr. 'anapo`deiktos; 'an
   priv. + 'apodeikto`s. See {Apodeictic}.]
   Not apodeictic; undemonstrable. [R.]
   [1913 Webster]