Contrary to what had been thought possible.(adverb)
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Use "impossibly" in a sentence
"Now, walking across campus, on course for what could be termed an impossibly random celestial event, he -- deep in thought, stroking his Clark Gable mustache, she -- in a hurry to connect with old friends, they -- the progeny of two of America's most influential leaders... collided."
"It is magnificently if rustically beautiful with red clay earth covered in impossibly green foliage."
"Every now and then he still heard of her, living down there, spending her days out in the woods and fields, and sometimes even her nights, they said, and steadily growing poorer and thinner and more eccentric; becoming, in short, impossibly difficult, as only"