slant + -wise
slantwise (not comparable)
- diagonal, in a direction or orientation between cardinal axes
- 1858, John Greenleaf Whittier, "Telling the Bees" in The Works of John Greenleaf Whittier, Vol. I, Narrative and Legendary Poems, 
- I can see it all now,—the slantwise rain / Of light through the leaves, / The sundown's blaze on her window-pane, / The bloom of her roses under the eaves.
slantwise (comparative more slantwise, superlative most slantwise)
- diagonally, in a direction or orientation between cardinal axes
- 1924, Herman Melville, Billy Budd, London: Constable & Co., Chapter 8, 
- […] he had received a cut slantwise along one temple and cheek, leaving a long scar like a streak of dawn's light falling athwart the dark visage.