obligatory

ADJ. Morally or legally constraining and/or binding.

ADJ. Required by obligation.

Your attendance at school is obligatory.

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oblivious

ADJ. Not having a keen conscious awareness; Lacking memory (forgetful)

1. Bush is oblivious to budget disaster.

2. It certainly takes some degree of obliviousness for someone who has
invited himself over to your table to recognize that he is unwelcome.

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