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The definition of unthinkable

3 Definitions of: unthinkable

1. adjective, not to be contemplated; out of the question
2. adjective, unimaginable; inconceivable
3. adjective, unreasonable; improbable
4. Show me some examples of this word: unthinkable
5. Show me the etymology of the word: unthinkable

Synonyms:	preposterous, impossible, inconceivable, unlikely, absurd, unreasonable, improbable, illogical, incredible, unbelievable

From Collins