Pérfido (en. Perfidious)
ˈpeɾ.fi.ðo
Slang Meanings
A person who deceives their friends.
That guy is perfidious, he only cares about himself.
Ese tipo es un pérfido, solo se preocupa por sí mismo.
Someone who acts treacherously in romantic relationships.
Don't talk to me about him, he's perfidious in love.
No me hables de él, es un pérfido en el amor.