In psychology and psychoanalysis, the feeling (conscious or subconscious) that one is somehow inferior to others, regardless of whether this is actually the case.
Example: Although the professor is highly accomplished and well-respected within her field, she has never been able to shake the feeling that she’s just not good enough and her success is a fluke.
Grinnell, R. (2009). Inferiority Complex. Psych Central. Retrieved on May 23, 2015, from http://psychcentral.com/encyclopedia/2009/inferiority-complex/