Longman Dictionary of Contemporary English homepage

oblivious

 adjective
     
o‧bliv‧i‧ous [not before noun]
not knowing about or not noticing something that is happening around you [= unaware]
oblivious of/to
He seemed oblivious to the fact that he had hurt her.
seemingly/apparently oblivious
Congress was seemingly oblivious to these events.
—obliviousness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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