The Collaborative International Dictionary of English v.0.48:

Tetric \Tet"ric\, Tetrical \Tet"ri*cal\, a. [L. tetricus,
   taetricus, from teter, taeter, offensive, foul.]
   Forward; perverse; harsh; sour; rugged. [Obs.] --
   Tet"ric*al*ness, n.
   [1913 Webster]