also: わるぐせ
noun
Refers to a persistent undesirable personal habit or moral failing.
彼の悪癖は、つい嘘をついてしまうことだ。
His bad habit is that he can't help telling lies.
喫煙は健康に悪い悪癖だ。
Smoking is a bad habit that harms your health.
Compound of 悪 (あく, 'bad') and 癖 (へき, 'habit'). The reading わるぐせ is a less common kun'yomi-based variant.