capable of being imagined or conceived.

1325–75; Middle English < Late Latin imāginābilis, equivalent to Latin imāginā() to imagine + -bilis -ble

imaginableness, noun
imaginably, adverb
unimaginable, adjective
unimaginableness, noun
unimaginably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unimaginable (ˌʌnɪˈmædʒɪnəbəl)
difficult or impossible to believe; inconceivable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Diamond anvil cells squeeze a material to intense pressures, and laser pulses
  heat it to unimaginable temperatures.
It's unimaginable that people could do this sort of astronomy without having
  high-powered computers to help with the task.
We believe the future will bring advances that are today almost unimaginable.
Delineated by caste, a society less fit for democracy was almost unimaginable.
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