What does sleuth mean?
A sleuth is a person who investigates mysteries, traces clues, or searches for reliable information. The verb “to sleuth” means to conduct a careful and persistent investigation, often involving documents, records, interviews, or other evidence. It has a mildly literary or journalistic flavor and is especially associated with determined reporters, amateur investigators, and private detectives. In everyday use, the word conveys curiosity, persistence, and an ability to uncover facts that others may have missed. Although “sleuth” can sound playful or informal, it is not limited to fictional detectives; it can describe real research into corruption, fraud, historical mysteries, or everyday inconsistencies. Its history is also distinctive: the word developed from the language of scent-tracking hounds and gradually came to mean an investigator. The related verb is often used with an object such as “information,” “evidence,” or a mystery, while phrases such as “sleuth out” emphasize the discovery of something hidden.
A person who investigates a mystery, gathers information, or searches for facts and evidence.
"The sleuth questioned witnesses and studied the documents for hours."
To investigate or search for something carefully and persistently, especially information, evidence, or the source of a mystery.
"She spent the evening sleuthing the ownership records of the property."
The plural is used when referring to more than one investigator or detective.
"Two seasoned sleuths joined forces to examine the case."
Before it meant a detective, sleuth referred to a hound trained to follow a scent: the word began as a description of a tracker, not an investigator.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does sleuth come from?
The word entered English in the early modern period in the compound “sleuthhound,” a hound trained to follow a scent. It ultimately draws on Old English slōþ, meaning “track” or “scent,” a word related to Old Norse sló, meaning “trail” or “track.” The word “sleuth” later came to mean an investigator by extension from the tracking animal, and the verb developed from that noun to mean “investigate” or “track down.”
Related word forms
How sleuth is actually used
The word is most natural in journalistic, literary, or informal contexts. As a noun, it often suggests a persistent and resourceful investigator; the more formal term is investigator or detective.
Easily confused with sleuth
A sleuth investigates mysteries or searches for information, whereas a sloth is either an extremely slow animal or a person characterized by laziness.