A long-established habit or practice that is difficult to change

एक पुरानी आदत या अभ्यास जो बदलना मुश्किल है

English Usage: His inveterate smoking habit worried his family.

Hindi Usage: उसकी पुरानी धूम्रपान आदत ने उसके परिवार को चिंता में डाल दिया।