Judas-like
/ˈdʒuːdəslʌɪk/adverb
In the manner of Judas Iscariot; traitorously, treacherously.
adjective
Resembling (that of) Judas Iscariot; characteristic or typical of Judas; traitorous, treacherous.
Origin
Mid 16th century. From the name of JudasIscariot + -like.