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Use "unchaperoned" in a sentence
"Siblings of the opposite sex should not interact in unchaperoned areas to abstain from the "appearance of evil." etc. etc."
"Never once was he so far from them that they could have exchanged a word unchaperoned by his throbbing ear."
"The activities of modern women—slumming, night life, exaggerations in dress, an unchaperoned life outside the home, entrance into business and sports—have erased the outward distinction between the painted sport and the paler protected lady."