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unthinkable

/ʌnˈθɪŋkəbəl/ adjective

In Latin: incōgitābilis Wiktionary

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about unthinkable at Wordnik → Where our words come from →

  1. Incapable of being conceived or considered.

Origin

From un- + think + -able.

From Wiktionary, via Kaikki.org (CC BY-SA)