|a.||1.||(Law) Not capable of making a will; not legally qualified or competent to make a testament.|
INTESTABLE. One who cannot law fully make a testament.
2. An infant, an insane person, or one civilly dead, cannot make a will, for want of capacity or understanding; a married woman cannot make such a will without some special authority, because she is under the power of her husband. They are all intestable.