adjective
describing something that is too terrible or extreme to be expressed in words
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The details of the crime were so unspeakable that the jury struggled to comprehend the magnitude of the situation.
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I can't even begin to describe the unspeakable mess that was left in the kitchen after the party.
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That movie was so unspeakable, I couldn't even make it through the first 10 minutes.
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The beauty of the sunset was so unspeakable that it left everyone in awe.