In an unforgettable manner; very memorably.(adverb)
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Use "unforgettably" in a sentence
"The definition of unforgettably sexy: A woman who can function on her own and take care of herself."
"Her own tone on the subject was uniform: she kept it on record to a degree slightly irritating that Mr. Dormer had been unforgettably -- Peter particularly noted "unforgettably" -- kind to her."
"Farrow recalls "unforgettably" that Campbell said she had been given a large uncut diamond, but does not recall actually seeing it."