Old Slang: Rogue
Slang words are so hard to etymologize because they are usually isolated, while language historians prefer to work with sound correspondences, cognates, and protoforms. Most modern “thick” dictionaries tell us that rogue, the subject of this post, is of unknown origin. This conclusion could be expected, for rogue, a 16th-century creation, meant “a wandering mendicant.” (Skeat attributes the original sense “a surly fellow” to it but does not adduce sufficient evidence in support of his statement.)