大根役者

Etymology
Compound of.

Derivation unknown. Possibly from the way that daikon as a food may be considered unsophisticated and crude; from the way that daikon are white, alluding to the term ; or from a well-known witticism that no matter how much daikon one eats, it never causes food poisoning / is worth notice (hinging upon the verb , meaning either “to hit the mark” / “to be worth notice”, or “to cause food poisoning”).

Noun

 * 1)  a bad actor, a wooden actor, a ham actor