oblique

indirect in departing from the accepted or proper way; misleading

used devious means to achieve success

gave oblique answers to direct questions

slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled

the oblique rays of the winter sun

acute and obtuse angles are oblique angles

a diagonally arranged abdominal muscle on either side of the torso

any grammatical case other than the nominative