He had a deep-rooted feeling of inferiority.inferiorityin‧fe‧ri‧or‧i‧ty /ɪnˌfɪəriˈɒrəti $ -ˌfɪriˈɔːr-/ noun [uncountable] 
moral inferioritysense/feeling of inferiority He had a deep-rooted feeling of inferiority.
COLLOCATIONS FROM THE ENTRY He had a deep-rooted feeling of inferiority.COLLOCATIONS FROM THE CORPUSADJECTIVE
when someone or something is not good or not as good as someone or something else OPP superiority: He had a deep-rooted feeling of inferiority.· The crime which justifies lynching him is a form of treason, not racial inferiority.
NOUN· This obviously affects them as they grow up, giving them an inferiority complex.· Thus, when awards time arrives, the old inferiority complexes become a factor and decisions often go in vaguely highfalutin directions.· Atlanta is on a massive ego trip, mixed with a congenital inferiority complex that makes Atlantans overly eager to impress others.
VERB· The feeling of inferiority is defensively turned into a feeling of superiority.
moral inferioritysense/feeling of inferiority He had a deep-rooted feeling of inferiority.