1. 
   ninjutsu
   ninjitsu noun the traditional Japanese method of espionage; involves stealthy movements and the use of camouflage
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=ninjutsu
   
   
2. 
   ninjutsu
   (from the article `martial art`) ...interested in combat concentrated on arts using the staff, everyday work implements (such as thrashing flails, sickles, and knives), and unarmed ...
   Found op http://www.britannica.com/eb/a-z/n/43
   
   
3. 
   Ninjutsu
   While there are several styles of "modern ninjutsu," the historical lineage of these styles is disputed. Some schools and masters claim to be "the only true and legitimate heirs" of the art, but ninjutsu is not totally centralized like modernized martial arts such as judo or taekwondo. Togakure-ryÅ...
   Found op http://en.wikipedia.org/wiki/Ninjutsu
   
   
4. 
   ninjutsu
   1) Martial art 2) Ninjitsu
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/ninjutsu/1
   
   

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