-Causing annoyance, irritation, or aversion; repellent.
-Unattractive and objectionable.
From French "rébarbatif", from Medieval French, from "rebarber" to be repellent, from "re"- + "barbe" beard, from Latin "barba". First Known Use: 1892.
Used in a sentence:
“Why does your kid brother insist on being such a rebarbative little deuce?”
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