When you do something mechanically, you do it in a routine, automatic way, without much thought or feeling. If you have to get up unusually early in the morning, you might get dressed mechanically, still half-asleep.

People who are tired, stunned, or deeply upset will sometimes do things mechanically, working or performing tasks without emotion. When you act mechanically, you're machine-like. The adverb mechanically comes from the adjective mechanical, which since the 1600's has been used to describe people who "resemble machines." The Greek root is mekhane, "device."

Definitions of mechanically
  1. adverb
    in a mechanical manner; by a mechanism
    “this door opens mechanically
    synonyms: automatically
  2. adverb
    in a machinelike manner; without feeling
    “he smiled mechanically
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