The reading かってな comes from a specific compound usage of 勝 (katsu, 'win') and 手 (te, 'hand'), forming a jukujikun-like pattern. Misreadings like がってな (voicing) or かつてな (on'yomi or full kun'yomi) are incorrect. This word describes someone acting selfishly or arbitrarily, doing as they please without regard for others, often causing inconvenience.

「勝手な」は、勝（かつ）と手（て）を組み合わせた特殊な読み方です。がってなやかつてなは誤り。他人のことを考えず、自分本位に振る舞う様子を表し、しばしば周りに迷惑をかけるニュアンスを含みます。