Compulsive describes behavior that's very difficult to stop or control, even when you want to. Someone who checks their backpack repeatedly before leaving for school, even after confirming everything's there, might be acting compulsively. A person who can't stop biting their nails, despite trying hard to quit, has a compulsive habit.

The word suggests something stronger than just a bad habit. Compulsive behaviors feel almost impossible to resist, like an internal pressure pushing you to do something over and over. A compulsive liar tells lies even when the truth would work better, often without thinking first. Someone might be a compulsive organizer, constantly rearranging their desk even when it's already neat.

Compulsive is related to the word compulsion, which is the strong urge itself. You might feel a compulsion to wash your hands again and again, making the behavior compulsive. These behaviors often start as a way to feel more in control or less anxious, but they can take over and interfere with daily life.

Not every repeated action is compulsive. Practicing piano daily because you love music is dedication. But if you felt you had to practice even when you were sick or exhausted, unable to stop yourself, that would be closer to compulsive behavior.