re·bar·ba·tive (rē-bär'bə-tĭv) adj. Tending to irritate; repellent: "He became rebarbative, prickly, spiteful"(Robert Craft).
[French rébarbatif, from Old French, from (se) rebarber, to confront : re-, re- + barbe, beard (from Latin barba; see bhardh-ā- in Indo-European roots).]