anormal
/anoɾˈmal/ · B2 · adj
abnormal
🤪 a- (not) + normal = not normal, so abnormal, and slangily 'dumb'
Spanish anormal is built from the prefix a- (not, without) plus normal. Something not normal is abnormal. In casual speech, calling a person anormal means their behavior is so off-norm that they seem dumb or foolish.