According to Adler, inferiority complex is a problem affecting adults who have not been able to overcome the feelings of inferiority that they developed as children, when they were small and limited in their knowledge about the world.
According to Alfred Adler, inferiority complex is an unconscious condition where the individual feels inadequate and resentful, often because of some physical feature regarded as a defect. This complex leads to distorted behaviors, the most striking of which is overcompensation for the perceived defect-a mechanism often invoked to explain aggressiveness in small men.