Merriam-Webster's Collegiate® Dictionary, 11th Edition
UNCONSCIOUS
I. adjective
Date: 1712
1. not knowing or perceiving ; not aware, free from self-awareness,
2. not possessing mind or consciousness , b. not marked by conscious thought, sensation, or feeling , of or relating to the unconscious, having lost consciousness , not consciously held or deliberately planned or carried out , unconsciously adverb unconsciousness noun
II. noun
Date: circa 1912
the part of mental life that does not ordinarily enter the individual's awareness yet may influence behavior and perception or be revealed (as in slips of the tongue or in dreams)