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Synonyms for Automatic (same or very similar meaning)

WordNet sense 1 (light machine gun):
automatic rifle, machine rifle

WordNet sense 2 (a pistol that will keep firing until the ammunition is gone or the trigger is released):
automatic pistol

WordNet sense 3 (without volition or conscious control):
reflex, reflexive, reflex

WordNet sense 4 (controlled by the autonomic nervous system; without conscious control):

WordNet sense 5 (like the unthinking functioning of a machine):
automatonlike, machinelike, robotlike

WordNet sense 6 (using (or as if using) mechanisms or tools or devices):

WordNet sense 7 (designed to activate or move or regulate itself):
self-regulating, self-acting, self-moving

From the ODE community, based on WordNetadd/edit