Some of the ladies, especially those who came from a distance, made their appearance in the gallery very smartly dressed, but the majority of the ladies were oblivious even of dress.
He had become terribly preoccupied since the trial; sometimes he would be silent for half an hour together, and seemed to be pondering something heavily and painfully, oblivious of everything about him.
There are no more uses of "oblivious" in the book.
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She is oblivious to the dangers.
She’s a happy girl—oblivious to most of the unhappiness around her.