1.
If you say that something is ~, you are emphasizing that it cannot possibly be accepted or imagined as a possibility.
Her strong Catholic beliefs made abortion ~.
ADJ: usu v-link ADJ emphasis
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The ~ is something that is ~.
Edward VIII had done the ~ and abdicated the throne.
N-SING: the N
2.
You can use ~ to describe a situation, event, or action which is extremely unpleasant to imagine or remember.
This place is going to be ~ without you.
ADJ