automatic

[1]	automatic rifle , machine rifle
[2]	automatic pistol

adj.

[1]	self-acting , self-governing , self-regulating , mechanical , robot , automated
[2]	mechanical , involuntary , unconscious , instinctive/instinctual , natural , spontaneous , impulsive , conditioned , reflex , robot-like , (Slang) knee-jerk
[3]	unavoidable , inevitable , inescapable , ineluctable
[4]	automatonlike , machinelike , robotlike , robotic
[5]	reflexive