Automatonlike

Resembling an automaton; moving or acting in a mechanical, robotic, or repetitive way without showing feeling or awareness.

From 'automaton' (a mechanical figure) + '-like' (resembling). 'Automaton' comes from Greek 'autos' (self) + 'matos' (moving), literally a self-moving thing. The '-like' suffix is Old English in origin, combining into countless descriptive adjectives.