What does rogue mean?
Rogue originally described a dishonest or unprincipled person, especially a scoundrel or someone outside respectable society. Today it remains common for that meaning, but it has also broadened to describe people, animals, machines, and natural phenomena that act unpredictably or outside normal control. A rogue employee may ignore company procedures, while a rogue software system operates without authorization. The expression go rogue is especially common in informal and technological contexts for becoming uncontrollable or deliberately independent. Although rogue can sound dramatically negative, it is sometimes used approvingly of someone who refuses to conform, especially when independence is presented as a virtue. The word is vivid because it combines the ideas of bad character, lack of authority, and unpredictability, making it useful whenever something has escaped ordinary rules or expectations.
A dishonest, unprincipled, or mischievous person; someone who acts independently of normal rules or authority; or an unpredictable or troublesome thing.
"The investigators suspected that the missing money had been taken by a rogue within the organization."
The sense meaning a scoundrel is strongly negative. The independent or disruptive senses are common in modern usage, especially about agents, systems, animals, and natural phenomena.
Dishonest or unprincipled; acting independently of accepted rules or authority; or unexpected, disruptive, and difficult to control.
"The security team isolated the rogue device that had been communicating with an outside server."
In technical and business contexts, rogue often describes an unauthorized, independently operating, or noncompliant entity rather than a person.
The plural is used for multiple dishonest or unconventional people and for multiple instances of a rogue person, system, animal, or thing.
"The novel depicts a group of rogues who operate beyond the reach of the law."
From a scoundrel to a computer that has gone rogue, rogue has become a vivid label for anything that breaks the rules.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does rogue come from?
The word entered Middle English from Old French rogue, where it referred to a vagabond, scoundrel, or dishonest person. Its ultimate origin is uncertain, although the word developed in English from older senses of a wandering or unprincipled person into its modern moral and figurative meanings. The related forms roguish and roguery developed from the same English root.
Related word forms
How rogue is actually used
The word often carries a strongly negative moral judgment when it describes a person, but it can be more neutral or even approving when it means independent, unconventional, or resistant to control. In technology and business, rogue agent and rogue system often mean an unauthorized or independently operating system.
Easily confused with rogue
Rogue means a dishonest or unprincipled person, while rouge is a red cosmetic or coloring used on the cheeks or lips.