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Use "uneditable" in a sentence
"During an instant messenger conversation you pass back and forth a series of single-author, uneditable messages."
"Also make that bit of the article positively uneditable once it goes in, whatever happens to the rest of the article."
"A Quick Edit always produces an error message although the edit seems to go thru and, of course, the text in the Press This window is transparent, so uneditable until after saving and returning to the draft."