Learn how to say Impossibly correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word impossibly:
1 [as submodifier] so as to be impossible:
every task seemed impossibly difficult
[sentence adverb] used to describe an event or action that is so difficult or unlikely one would not expect it to be possible:
he held her and, impossibly, she fell asleep
2 [as submodifier] possessing the specified quality to an unbelievably high degree:
her impossibly blonde hair