adjective. Alternative spelling of incontestable.

adjective. incapable of being contested or disputed

"Nelson, astounded by his achievement, within the year drowned himself in an enormous quantity of cheap whisky, and, the will being incontestible through lack of kith and kin, left his half to Lucky Richard Forrest."

bullet-proof  demonstrable  demonstrated  inarguable  incontrovertible  

PCB  business  butclear  dead-stick  exculpatory  

incontestable