A straightforward phrase meaning a habit that is undesirable or harmful. Often used in self-reflection or gentle criticism.
Biting your nails is a bad habit.
He has a bad habit of being late.
Standard kanji spelling.
Mixed kanji-kana spelling; less common but still used.
Compound of 悪い (bad) and 癖 (habit). The phrase is transparent and follows standard adjective-noun modification.