What does disloyal mean?
"Disloyal" is an adjective describing someone or something that fails in fidelity or allegiance to a person, group, institution, or cause that commands their loyalty. A disloyal friend betrays a friendship; a disloyal employee undermines an employer; a disloyal citizen turns against their country. The word carries a strongly negative moral charge, implying not merely disagreement but a breach of trust or obligation. It is most often used with the preposition "to": one is disloyal to a partner, a party, or a crown. The term sits on a spectrum of severity — milder than "treasonous," which denotes criminal betrayal of the state, but harsher than neutral descriptions like "nonconformist" or "independent." Its derived forms include the noun "disloyalty" and the adverb "disloyally." Rooted historically in notions of lawful fealty, the word remains central to political, professional, and personal discourse wherever allegiance matters, making it a precise and forceful term for condemning betrayal.
adjectiveNot loyal or faithful to a person, group, country, or cause to which one owes allegiance; betraying trust or commitment.
- Not faithful to a person, group, nation, or cause one owes allegiance to; betraying trust.
- (Of actions or remarks) showing or suggesting a lack of loyalty or faithfulness.
"The general was executed for being disloyal to the crown."
"He was dismissed from the service for passing secrets — an act the court judged deeply disloyal."
"She felt it would be disloyal to criticize her old mentor in print, however much she disagreed with him."
In Britain, the official Opposition is sometimes called "Her Majesty's Loyal Opposition" — because opposing the government while staying faithful to the crown is, paradoxically, considered the opposite of disloyal.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of disloyal
"Disloyal" derives from the Old French "desloial", formed from the prefix "des-" (expressing negation) plus "loial" meaning lawful, legitimate, or faithful, which itself comes from Latin "legalis", relating to law (from "lex", "legis"). The word entered Middle English around the 14th century, when loyalty was closely bound to legal fealty owed a lord or sovereign. It shares its ultimate root with words such as "legal", "legitimate", and "allegiance", all tracing back to the Latin notion of law-bound obligation.
Related word forms
How disloyal is actually used
"Disloyal" carries strong negative moral connotation and is typically used of people, their conduct, or their attitudes toward institutions such as family, employers, parties, or nations. It is more formal in tone than everyday terms like "two-faced" and less extreme than "treasonous," which implies criminal betrayal of one's state. The preposition "to" almost always follows: disloyal to someone or something.
Easily confused with disloyal
"Disloyal" means unfaithful or treacherous, while "disillusioned" means disappointed after losing one's naive beliefs.
"Diloyal" is not an English word; the correct spelling of the adjective meaning unfaithful is "disloyal."