noun
bad habit; weakness; peculiarity
Refers to a deeply ingrained bad habit or personal weakness, often one that is hard to correct. Can also mean a peculiarity or idiosyncrasy.
彼の病癖は、すぐに人の話を遮ることだ。
His bad habit is interrupting people right away.
遅刻癖はなかなか直らない病癖だ。
Chronic lateness is a bad habit that is hard to break.