"Unsifted" Natural Recordings by Native Speakers
Unsifted refers to something that has not been sorted or sifted through, often in a figurative sense, to separate what is useful from what is not. In other words, it can describe something that is a mixture of good and bad, useful and useless, or relevant and irrelevant information, and has not been filtered or categorized yet.
To unsheathe something means to take a sword or other sharp blade out of its cover or scabbard, or to remove or reveal something that has been hidden or covered up.
Not showing a smile or looking serious. Expressed or marked by a lack of happiness or friendliness.