反駁 (はんばく) uses the on'yomi 反 (ハン), meaning against or contrary, and 駁 (バク), meaning to refute or object. Incorrect readings like はんぱつ are often confused with 反発 (rebellion/repulsion), while ひぼう and はんぎ are misreadings. It specifically means to present an argument or evidence against a claim, i.e., a rebuttal or refutation.

反駁（はんばく）は両漢字とも音読み。反（ハン）は「かえす」、駁（バク）は「いい返す」の意味。はんぱつ（反発）と混同されやすく、ひぼう・はんぎは誤読です。相手の意見や論証に対して、論拠を挙げて反論することを指します。