Adjective
/dɛs.leˈal/
The word "desleal" is used to describe a lack of loyalty or fidelity towards a person, cause, or principle. In legal contexts, it can refer to actions that betray a duty of loyalty, such as in contracts or fiduciary relationships. Its frequency of use varies but it is widely understood in both oral and written Spanish, with no marked preference for one over the other.
His disloyal attitude towards his coworker cost him his job.
No puedo confiar en alguien que es desleal con sus amigos.
I cannot trust someone who is unfaithful to their friends.
En el ámbito legal, actuar de manera desleal puede tener consecuencias graves.
While "desleal" may not be part of many idiomatic expressions, it is often used in contexts that emphasize betrayal or loyalty. Here are some relevant expressions:
"You can't be disloyal to someone who has always been by your side."
Desleal por naturaleza
"Some argue that a disloyal runner by nature will never win races."
Un pacto desleal
"That deal is a disloyal pact between the involved parties."
Desleal en el amor
The word "desleal" comes from the Latin "disleialis," where "dis-" means "not" and "lealis" stems from "lex" or "legis," meaning "law." Thus, "desleal" implies a deviation from loyalty, fidelity, or faithfulness as upheld by the law or moral guidelines.