Kleptomaniac
/ˌkleptəˈmeɪniæk/
Definition 1 of 1
Pro Tip 1/3Psychological Disorder
Understand 'kleptomaniac' identifies a mental health condition, not just a habit of stealing. 
The court considered her status as a kleptomaniac before sentencing.
Pro Tip 2/3No Financial Motive
'Kleptomaniac' implies stealing without the need for the item, not for profit or economic gain. 
Even though he is wealthy, he can't resist stealing small trinkets, he's a kleptomaniac.
Pro Tip 3/3Irresistible Impulse
Focus on the uncontrollable urge aspect that a kleptomaniac experiences, not casual theft. 
As a kleptomaniac, she felt an overpowering need to steal the lipstick.