perpendicular Antonyms

parallel oblique at an oblique angle crossways transversely transverse slopy sloped slopping slantwise sideways sidelong sideling oblique angle kitty-corner at an incline at an inclination slopingly slantways slantingly sideway upside down nonintersecting nonconvergent kitty-cornered catty-corner catercorner recumbent procumbent circumflex canted billowing beveling bevelled beveled atilt aslope aslant askew antiparallel collateral crosswise naiant longitudinal level inclined horizontal gradual graded flat