crossways vs crosswise

crossways is not an adjective while crosswise is an adjective.

Word	Noun	Adjective	Verb	Adverb
crossways	No	No	No	Yes
crosswise	No	Yes	No	Yes

As adverbs, crossways and crosswise are synonyms defined as:

Other synonyms of crossways include across.

crossways (adjective)	crosswise (adjective)
	lying or extending across the length of a thing or in a cross direction
	in the shape of (a horizontal piece on) a cross

crossways (adverb)	crosswise (adverb)
transversely	transversely
	not in the intended manner