Inferiority is the quality of being worse than other things or people.
You know how some movies are terrible — inferior — compared to other movies? You've noticed the inferiority of those films. Inferiority is a quality possessed by people and things that are not as good as others. To a king, the common people are defined by their inferiority. Most people agree on the inferiority of a TV dinner to a home-cooked meal. When someone feels like they are always worse off than others, they have an inferiority complex. Inferiority is the opposite of superiority.