Selfless Share definition Flag 1. Someone who cares more about other people than themselves.2. Having little or no concern for oneself.3. Devoted to others. "She's so selfless, I can't believe she gave her 50$ to a hobo.""Christy is helping her abusive boyfriend get his life back and she doesn't even love him anymore. Why is she being so selfless?" Selfless by SpaceGuns January 24, 2010 Get the Selfless mug.