斜

The line is drawn askew.

This wall is a little out of the perpendicular.

slanted shadow on the floor

leaning tower

be written on a slant

cut (cloth) on the bias

angle across the road

be seriously off plumb

The sun is setting/sinking in the west. / The sun is declining towards the west.

slant upwards/downwards

tip one's head to one side

be slanted to the right/left

give sb an oblique glance