Simple past tense and past participle of unrate.(verb)
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Use "unrated" in a sentence
"The word unrated conjures up images of wild orgies, gimp masks and innocent virgins being sawed in half."
"All the dir. cuts ( "unrated" - ugh) of things like "Knocked Up" and its ilk are shameless money-grabs."
""Unrated-extended edition", but in a movie that featured prominent dudity (and from the lead, at that), nothing really feels "unrated" - but, rather, deleted."