Collins COBUILD Advanced Learner's English Dictionary - unthinkable

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