If you're disloyal, you're not faithful or trustworthy — you can't be depended on by those who put their trust in you. It would be disloyal to join in with a group of people gossiping about your best friend.

It's disloyal when a country violates a signed treaty, and it's disloyal for a citizen to spy for a foreign state against its own government. But it's also disloyal to betray the trust of someone in your life. A disloyal sibling tattles on his brothers and sisters, and a disloyal friend won't keep your secrets. This adjective comes from the Old French desloial, "treacherous or deceitful," which adds the prefix des-, "the opposite of," to loial, "faithful."

Definitions of disloyal
  1. adjective
    deserting your allegiance or duty to leader or cause or principle
    disloyal aides revealed his indiscretions to the papers”
    faithless, traitorous, treasonable, treasonous, unfaithful
    having the character of, or characteristic of, a traitor
    insurgent, seditious, subversive
    in opposition to a civil authority or government
    consisting of or characterized by or inciting to mutiny
    participating in organized resistance to a constituted government
    recreant, renegade
    having deserted a cause or principle
    showing lack of love for your country
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    steadfast in allegiance or duty
    steadfast in devotion (especially to your lawful monarch or government)
    resembling a dog; especially in devotion
    hard-core, hardcore
    intensely loyal
    faithful and true
    owing or owed feudal allegiance and service
    marked by unswerving loyalty
    loyal, patriotic
    inspired by love for your country
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  2. adjective
    showing lack of love for your country
    synonyms: unpatriotic
    considered contrary to the best interests of the United States
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    loyal, patriotic
    inspired by love for your country
    steadfast in allegiance or duty
    chauvinistic, flag-waving, jingoistic, nationalistic, superpatriotic, ultranationalistic
    fanatically patriotic
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