IPA: //ʌnˈdaʊbld//
KK: /ʌnˈdaʊbld/
Not having been increased in quantity or size by doubling.
The undoubled amount of money was sufficient for the project.
Undoubled → It is formed from "un-" (meaning not) and "doubled" (from the root "double" which comes from Old French *dobler*, meaning to make double or to duplicate). The word "undoubled" means not made double or not duplicated.
Think of 'not' ('un-') making something 'double' ('doubled') — that's why undoubled means it hasn't been made double.