unthinkable
AdjectiveUS[uhn-thing-kuh-buhl]/ənˈθɪŋkəbəl/4 syllables
Open English WordNet
Adjective (1)
- incapable of being conceived or consideredOpposite thinkableSimilar impossible, inconceivableSee also incredible, impossible
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haphazardadjective
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Webster's Dictionary (1913)
Unthinkable
Formed with the prefix un- (“not”). See thinkable.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54