doited

From Middle English doten (“to behave foolishly”).

doited (comparative more doited, superlative most doited)

1. (Scotland) Afflicted with weak-mindedness, usually caused by senility
   • 1902, John Buchan, The Outgoing of the Tide:

     One man only worked on the place, a doited lad who had long been a charge to the parish, and who had not the sense to fear danger or the wit to understand it.

• senile

• doitrified