The Collaborative International Dictionary of English v.0.48:

Uneth \Un*eth"\ ([u^]n*[e^]th"), Unethes \Un*ethes"\, adv.
   With difficulty; scarcely. See Uneath. [Written also
   unethe, unneth, unnethe, unnethes, etc.] [Obs.]
   --Chaucer.
   [1913 Webster]