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oblivious

[uh-bliv-ee-uh s] /əˈblɪv i əs/
adjective
1.
unmindful; unconscious; unaware (usually followed by of or to):
She was oblivious of his admiration.
2.
forgetful; without remembrance or memory:
oblivious of my former failure.
3.
Archaic. inducing forgetfulness.
Origin
late Middle English
1400-1450
1400-50; late Middle English < Latin oblīviōsus forgetful, equivalent to oblīvī(scī) to for-get + -ōsus -ous
Related forms
obliviously, adverb
obliviousness, noun
self-oblivious, adjective
semioblivious, adjective
semiobliviously, adverb
semiobliviousness, noun
unoblivious, adjective
unobliviously, adverb
unobliviousness, noun
Can be confused
oblivious, obvious.
Synonyms
2. See absent-minded.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for obliviousness

oblivious

/əˈblɪvɪəs/
adjective
1.
foll by to or of. unaware or forgetful
Derived Forms
obliviously, adverb
obliviousness, noun
Usage note
It was formerly considered incorrect to use oblivious to mean unaware, but this use is now acceptable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for obliviousness

oblivious

adj.

mid-15c., from Latin obliviosus "forgetful, that easily forgets; producing forgetfulness," from oblivion (see oblivion). Meaning "unaware, unconscious (of something)" is from 1862, formerly regarded as erroneous, this is now the general meaning and the word has lost its original sense of "no longer aware or mindful." Properly should be used with to, not of. Related: Obliviously; obliviousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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