A psychological term referring to an intense feeling of being inferior to others. Often used in everyday language to describe a lack of self-esteem.
He suffers from an inferiority complex.
It's difficult to overcome an inferiority complex.
A broader term for any psychological complex, often used in compounds like 劣等感 (inferiority feeling) or 劣等コンプレックス (inferiority complex). 劣等複合 is a more formal, technical term.
Compound of 劣等 (inferiority) and 複合 (complex), likely a calque from German 'Minderwertigkeitskomplex' or English 'inferiority complex'.