Which of the following words is closest in meaning to “Oblivious”?

Oblivious means unaware of what is happening around one.

• Correct answer - unaware: it has the same meaning as Oblivious.
• indispensable: absolutely necessary - wrong, it does not mean the same as Oblivious.
• imminent: about to happen - wrong, it does not mean the same as Oblivious.
• observant: quick to notice things - wrong, it does not mean the same as Oblivious.