Unable to avoid some outcome or action, either because of some irresistible urge or because of powers outside of one's control. This phrase is often used to defend one's actions as involuntary or unavoidable. I don't want to be late to work every day, but I haven't been able to help it—the public transit strike has totally thrown off the train schedule. I know I should cut down on the cakes and treats in the evening, but I'm just not able to help it!