: not conscious: such as
a
: not awake especially because of an injury, drug, etc.
He was knocked unconscious by a fall.
She was unconscious for three days after the accident.
b
: not aware of something
—usually + of
He is unconscious of his mistake.
She was unconscious of being watched.
c
: not intended or planned : not consciously done
an unconscious mistake
an unconscious bias
: the part of the mind that a person is not aware of but that is often a powerful force in controlling behavior
Cite this Entry
“Unconscious.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/unconscious. Accessed 24 Jun. 2026.
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