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Use "unobserved" in a sentence
"He hurried to the thatched house, and slipped in unobserved through the back-door."
"So this is what the much vaunted scientific position become - faith in unobserved physical processes."
"The recent spate of showbiz deaths only points to the fact that life, no matter how opulent or in debt, no matter how famous, infamous or unobserved is short and not always sweet."