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Use "untagged" in a sentence
"The tagging interface is designed to allow you to quickly label your untagged apps with the tags that make the most sense to you."
"Yojimbo also offers 10 smart collections with fixed criteria like "untagged" or "flagged.""
"Maybe a way of setting a default tag of "untagged" that automatically gets applied when you just click the bookmark star, although that wouldn't help with my many existing untagged bookmarks."