Mental Incapacity
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
Lack of sufficient mind and memory on the part of a grantor or testator to comprehend the nature and character of the transaction in which he was engaged.
230 111. 586; 93 111. 516.