disloyal

/dɪsˈlɔɪ(ə)l/

/dɪsˈlɔɪəl/

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”

   synonyms:

   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

   mutinous

   consisting of or characterized by or inciting to mutiny

   rebellious

   participating in organized resistance to a constituted government

   recreant, renegade

   having deserted a cause or principle

   unpatriotic

   showing lack of love for your country

   antonyms:

   loyal

   steadfast in allegiance or duty

   allegiant

   steadfast in devotion (especially to your lawful monarch or government)

   doglike

   resembling a dog; especially in devotion

   hard-core, hardcore

   intensely loyal

   leal

   faithful and true

   liege

   owing or owed feudal allegiance and service

   true-blue

   marked by unswerving loyalty

   loyal, patriotic

   inspired by love for your country
2. adjective

   showing lack of love for your country
   synonyms: unpatriotic

   un-American

   considered contrary to the best interests of the United States