unthinkable
/ʌnˈθɪŋkəbəl/ adjective C1- That cannot be believed. · Near-synonyms: unbelievable, incredible, inconceivable
- Inconceivable or unimaginable; extremely improbable in a way that goes against common sense. · Near-synonyms: inconceivable, imponderable
- Extremely improper; extremely at odds with norms of expected behavior. · Near-synonyms: taboo, unspeakable, unutterable, inconceivable
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