Simple past tense and past participle of uncompress.(verb)
Not having been compressed.(adjective)
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Use "uncompressed" in a sentence
"Speaking of which, just got the Snakes and Ladders concert BluRay disc … I like listening to live recordings of music mixed in uncompressed, high-definition 5.1 sound."
"I just wish I could get my music in uncompressed 44. 1K/16 bit (or better)."
"In addition, sample images, the first page of the first letter written by each of the three letter writers, were scanned at 300-dpi in uncompressed TIFF format."