not conscious; without awareness, sensation, or cognition.
temporarily devoid of consciousness.
not perceived at the level of awareness; occurring below the level of conscious thought: an unconscious impulse.
not consciously realized, planned, or done; without conscious volition or intent: an unconscious social slight.
not endowed with mental faculties: the unconscious stones.
the unconscious, Psychoanalysis. the part of the mind containing psychic material that is only rarely accessible to awareness but that has a pronounced influence on behavior.

1705–15; 1915–20 for def 6; un-1 + conscious

unconsciously, adverb
unconsciousness, noun
quasi-unconscious, adjective
quasi-unconsciously, adverb
self-unconscious, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unconscious (ʌnˈkɒnʃəs)
1.  lacking normal sensory awareness of the environment; insensible
2.  not aware of one's actions, behaviour, etc: unconscious of his bad manners
3.  characterized by lack of awareness or intention: an unconscious blunder
4.  coming from or produced by the unconscious: unconscious resentment
5.  psychoanal See also collective unconscious subconscious Compare preconscious the part of the mind containing instincts, impulses, images, and ideas that are not available for direct examination

unconsciousness (ʌnˈkɒnʃəsnɪs)
the state of being without normal sensory awareness; insensibility

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1712, "unaware, not marked by conscious thought," from un- (1) "not" + conscious. Meaning "temporarily insensible, knocked out" is recorded from 1860. In psychology, the noun the unconscious (1884) is a loan-translation of Ger. das Unbewusste. The adj. in this sense is recorded from 1912.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

unconscious un·con·scious (ŭn-kŏn'shəs)

  1. Of or in a state of unconsciousness; not conscious.

  2. Occurring in the absence of conscious awareness or thought, as an emotion or motive.

  3. Without conscious control; involuntary or unintended.

In psychoanalytic theory, the division of the mind containing elements of psychic makeup, such as memories or repressed desires, that are not subject to conscious perception or control but that often affect conscious thoughts and behavior.
un·con'scious·ly adv.

unconsciousness un·con·scious·ness (ŭn-kŏn'shəs-nĭs)
A state of impaired consciousness in which one shows no responsiveness to environmental stimuli but may respond to deep pain with involuntary movements.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

unconscious definition

The part of the psyche lying far below consciousness and not easily raised into consciousness. In Freudian psychology, the unconscious cannot be directly observed with the conscious mind, but it has its own processes and deeply affects conscious thought.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Episodes can last from a few seconds to a few minutes, and may cause
Nutmeg stared transfixed at the submarine, until she slipped into
Think of it as a spectrum whose extremes are unconsciousness at the negative
  end and hyperconsciousness at the positive end.
They set about their work in a spirit of sublime unconsciousness.
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