inconceivable

adjective
     
in‧con‧ceiv‧a‧ble
too strange or unusual to be thought real or possible:
A few years ago a car fuelled by solar energy would have been inconceivable.
It is inconceivable that a man in such a powerful position could act so unwisely.
inconceivably adverb

Dictionary results for "inconceivable"
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