uninflected

taivuttamaton

soinniton

tulehtumaton puhekieltä That does not use inflection.
puhekieltä That has not been inflected.
1955: Geoffrey Chaucer, Richard Middlewood Wilson, Simon Bredon, Derek John de Solla Price, and Peterhouse (University of Cambridge) Library, The Equatorie of the Planetis, http://books.google.co.uk/books?id=d44LAQAAIAAJ&dq=%22grada,+minuta,+introitus%22&lr=&ei=IjA1SoHDBp-8zASF-_i1Bg page 161 (Cambridge University Press)

It seems that many such technical words (grada, minuta, introitus) were left in the uninflected state when contracted in any customary form such as we have …