IPA: /ʌnˈdaʊtəbl/
KK: /ʌnˈdaʊtəbl/
Something that cannot be doubted or questioned; certain and clear.
It is undoubtable that she is the best candidate for the job.
Undoubtable → It is formed from "un-" (meaning not) and "doubt" (from Old French *douter*, meaning to fear or be uncertain) and the suffix "-able" (meaning capable of). The word "undoubtable" means not capable of being doubted or certain.
Think of 'not' ('un-') being combined with 'doubt' — this helps you remember that 'undoubtable' means something that cannot be doubted.