decepcionar
/deθebθjoˈnaɾ/ · B1 · verb
to disappoint, to let down, to underwhelm
🥀 False friend: not deceive, but disappoint, the let-down after a deception
Both come from Latin deceptio, a trick. In English the word kept the trick and became deceive; in Spanish it kept the feeling afterwards. Me decepcionaste = you let me down. To deceive is engañar.