ditzy

Since early 1800s commonly used by Pennsylvania Dutch (Penslfawnisch Deitsch); possibly a borrowing from dialectal German dutzig, also dützig, ditzig (“numb, dazed, dizzy, as after having been punched; dull, stupid”), from dialectal dutzen (“to butt, hit, punch”). Compare German verdutzt (“dumbfounded”) and regional Dötsche (“bump, dent, bruise”). Unlikely, an alteration of dizzy, of American origin.