Synonyms and antonyms of Disloyal people in British Thesaurus

Judas (noun)

someone who hurts a friend by behaving in a way that is not loyal

traitor (noun)

informal someone who is not loyal to their friends, family, or employer

turncoat (noun)

someone who stops supporting a particular group and joins an opposing group

rat (noun)

informal someone who is not loyal or who tricks you

fifth column (noun)

a group of people who secretly support enemies of their country or opponents of the organization they belong to

a snake in the grass ()

someone you cannot trust