ninjutsu

/N IH1 N JH AH0 T S UW0/
noun
  1. 1

    A Japanese martial art that is a collection of techniques originally practiced for Japanese espionage purposes, and includes methods of gathering information, nondetection, avoidance, and misdirection techniques. Used by ninja (忍者).

Source: https://en.wiktionary.org/wiki/ninjutsu