WordNet sense 1 (a line or cut across a fabric that is not at right angles to a side of the fabric):

diagonal

WordNet sense 2 (a partiality that prevents objective consideration of an issue or situation):

preconception, prejudice

WordNet sense 3 (slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled):

oblique

WordNet sense 4 (cause to be biased):

predetermine