What does unthinkable mean in English?

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unthinkable Meaning, Definition, Pronunciation, Grammar & Synonyms❤️

0 so shocking that it cannot be imagined as possible:
- Today, we see growing acceptance of gay marriage - something that would have been unthinkable a generation ago.
1 an unthinkable event or situation:
- The unthinkable had happened - his secret activities had been discovered by the press.
2 too shocking or unlikely to be imagined as possible:
- A world without music would be unthinkable.
3 something that is very unlikely or undesirable:
- The president’s car did the unthinkable – it stopped at a red light.

To have abandoned such a long-standing project at such an advanced age was unthinkable and unrealistic.
Surely the unthinkable thought has become so explicit, there is no possibility of using more clichés or searchlight devices; the usual remedies have run out.
Certainly such correspondence is unthinkable without any notion of a formal grammar.
Most worrisome, he sees thoughts he considers unthinkable.
Compared with these figures, a target of 10 billion dollars was almost unthinkable.
Such comment would have been unthinkable before 1784, and the journal evidently had the protection of the liberal reformers in government.
Such studies would now be unthinkable, but it is difficult to see how else the results could have been obtained at that time.
The category of adjectives for example will admit new members fairly quickly, whereas the creation of new determiners is highly rare if not unthinkable.