Definition of impossible
1a
: incapable of being or of occurring
b
: felt to be incapable of being done, attained, or fulfilled : insuperably difficult
an impossible deadline
2a
: extremely undesirable : unacceptable
b
: extremely awkward or difficult to deal with
the actor was impossible on the set
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Merriam-Webster unabridged
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Time Traveler for impossible
The first known use of impossible was in the 14th century
See more words from the same century