horizontal Antonyms

vertical inclined unsloped slopping sloped sloping slopy steep tilted slantwise slanting rough salient shelvy sideling sidelong skew skewed slanted transversely upright tendentious slopingly slantways slantingly sideway jaggedy on end high-pitched low-pitched broken in catercorner kitty-corner skew-whiff oblique angle crossways oblique case verticle rent recumbent ramped corrugated circumflex chiselled cater-cornered canted cambered broken billowing beveling