1. Lacking awareness and the capacity for sensory perception; not conscious.
2. Temporarily lacking consciousness.
3. Occurring in the absence of conscious awareness or thought: unconscious resentment; unconscious fears.
4. Without conscious control; involuntary or unintended: an unconscious mannerism.
The division of the mind in psychoanalytic theory 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.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.