Sideways adverb 1 I slid off sideways: to the side, laterally. 2 the expansion slots are mounted sideways: edgewise, sideward/sidewards, side first, edgeways, end on, broadside. 3 he looked sideways at her: obliquely, indirectly, sidelong; covertly, furtively, surreptitiously, slyly.
adjective 1 sideways force: lateral, sideward, on the side, side to side. 2 a sideways look: oblique, indirect, sidelong; covert, furtive, sly, surreptitious