Of something that has been decrypted successfully, or of something that should have been encrypted, but was not.(adjective)
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Use "unencrypted" in a sentence
"Good faith effort to obtain unencrypted copy from copyright holders: has the same problems as licensing."
"If I break into your machine and am accessing it at your user level or at a higher level I will be looking at the same contents YOU are looking at - which is to say unencrypted unless you have lots of stuff you leave locked up and never use (lol)."
"Develop a plan to encrypt the tapes already off-site since you can't recall unencrypted tapes, either."