Simple past tense and past participle of unabbreviate.(verb)
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Use "unabbreviated" in a sentence
"Just inside the door sat a pair of metal cases, knee-high, hexagonal, green-grey, a sticker centered on each with Mina's name, unabbreviated, the way nobody ever used it."
"Some did so out of a desire for an unabbreviated expression of their African heritage that could not be mistaken or derided as an allusion to the afro hairstyle."
"One of the perks of being a bookseller is the ARC, sometimes called the advance reading copy in its unabbreviated form."