crosswise has 2 distinct synonyms spread across 1 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is lengthwise.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
lying or extending across the length of a thing or in a cross direction
“a crosswise street”
2 of the 4 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for crosswise.
Synonyms, antonyms and the broader and narrower relations for crosswise come from Princeton University’s WordNet. Full sources and licences.