陰いん忍にん

noun

covert ninja operations; stealthy infiltration

Historical term for a ninja carrying out secret missions while remaining unseen. Contrasts with 陽忍 (ようにん), which involves open disguise or social infiltration.

See also: 陽忍

• 陰いん忍にんは、姿すがたを隠かくして任にん務むを遂すい行こうする忍にん者じゃのことだ。