Primarily used for someone solving a mystery or crime, not just any investigator. The sleuth stepped into the shadowed alley, following the trail of the thief.
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Mystery Genre
Often found in mystery or detective fiction, making it a genre-specific term. She idolized the cunning sleuths in her favorite detective novels.
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Not All Professionals
'Sleuth' usually refers to private detectives, not to police officers or FBI agents. Despite not being a cop, the skilled private sleuth had a knack for solving cases.