unthinkable
adjectiveStress: second syllable
Syllables: un-think-a-ble (4)
English Definition
Too unlikely or unpleasant to be considered a possibility.
Example Sentence
A war between these countries was unthinkable a few years ago.
US IPA
/ʌnˈθɪŋkəbl/
UK IPA
/ʌnˈθɪŋkəbl/