talentless and incompetent; unaccomplished
A self-deprecating or critical description of someone lacking any particular skill or achievement. Often used in humble expressions about oneself.
I am a person with no special talents or abilities.
He is thought of as an incompetent and unaccomplished employee.
A yojijukugo (four-character compound) combining 無 (without), 芸 (art, skill), 無 (without), and 能 (ability). The exact origin is uncertain, but it follows a common pattern of negating two related qualities to emphasize complete lack.