Nihoner

“Mastermind” in Japanese

Short answer
首謀者 shubousha shubousha

Mastermind in Japanese is “首謀者” (shubousha). Full meaning: ringleader, mastermind, leader (of a plot).

Other ways to say “Mastermind” in Japanese

Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.