adjective
or in·con·test·ible |inkən|testəbəl
Etymology: incontestable from French, from in- in- (I) + contestable capable of being contested, from contester to contest + -able; incontestible, alteration of incontestable — more at contest
1. : not subject to being disputed, called in question, or controverted
incontestable evidence
: offering no grounds for doubt : indubitable , undoubted
an incontestable genius
2. : being such that payment of claims cannot be disputed by a life insurance company for any cause except nonpayment of premiums or other reason specifically stated in the contract when the contract has been in force for a stipulated period (as one or two years) and when an insurable interest existed at its inception
• in·con·test·able·ness noun -es