Ill-tempered and quarrelsome; disagreeable: disliked her cantankerous landlord.
Difficult to handle: "had to use liquid helium, which is supercold, costly and cantankerous"(Boston Globe).
[Perhaps from Middle English contek, dissension (influenced by such words as rancorous and cankerous), from Anglo-Norman contec, possibly from Latin contāctus, past participle of contingere, to touch; see contact.] can·tan'ker·ous·ly adv., can·tan'ker·ous·ness n.
1772, said to be "a Wiltshire word," probably an alteration (infl. by raucous) of M.E. contakour "troublemaker" (c.1300), from Anglo-Fr. contec "discord," from O.Fr. contechier, from con- "with" + teche, related to atachier "hold fast" (see attach).