Adjectives

(s)crabwise, sideways(of movement) at an angle

Adverbs

(r)sideways, sideway, sidewisewith one side forward or to the front“turned sideways to show the profile”, “crabs seeming to walk sidewise”
(r)sideway, sideways, sidewisefrom the side; obliquely“a picture lit sideways”, “scenes viewed sidewise”
(r)sideways, sideway, sidewisein a lateral direction“the car slipped sideways into the ditch”, “leaning sideways”, “a figure moving sidewise in the shadows”
(r)sidelong, sideways, obliquelyto, toward or at one side“darting eyes looking sidelong out of a wizened face”