His shyness is the result of an inferiority complex.
First Known Use of INFERIORITY COMPLEX
Medical Definition of INFERIORITY COMPLEX
: an acute sense of personal inferiority resulting either in timidity or through overcompensation in exaggerated aggressiveness
Acute sense of personal inferiority, often resulting in either timidity or (through overcompensation) exaggerated aggressiveness. Though once a standard psychological concept, particularly among followers of Alfred Adler, it has lost much of its usefulness through imprecise popular misuse.