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In some senses, oblivious is marked as dated. Watch for register when choosing this word.
oblivious
UK /əˈblɪviːəs/ US /əˈblɪviːəs/
adj 2
Definitions
adj
1
Lacking awareness; unmindful; unaware, unconscious of.
Your grandmother is completely oblivious to her surroundings.
2
Forgetful.
He's hopelessly oblivious, always forgetting his appointments.
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