1772, said to be "a Wiltshire word," probably from an alteration (influenced by raucous) of Middle English contakour "troublemaker" (c.1300), from Anglo-French contec "discord, strife," from Old French contechier (Old North French contekier), from con- "with" + teche, related to atachier "hold fast" (see attach). With -ous. Related: Cantankerously; cantankerousness.