ninja
//ˈnɪn.dʒə//
Noun
ninjaSingular
ninjasPlural
1
A person trained in ancient Japanese martial arts and employed especially for espionage, sabotage, and assassination.
The ninja moved silently through the shadows to complete his mission.
2
(informal) A person who is exceptionally skilled or stealthy in a particular activity.
She's a real ninja when it comes to fixing computer problems.