To be weak-minded, silly, or idiotic; to have the intellect impaired, especially by age, so that the mind wanders or wavers; to drivel.
“Time has made you
dote, and vainly tell
Of arms imagined in your lonely cell.”
— Dryden.
“He survived the use of his reason, grew infatuated, and
doted long before he died.”
— South.