(ˌʌnsəbˈdjuːəbəl) adjnot able to be subduedThesaurus
Adj.
1.
unsubduable - impossible to subdueindomitable, never-say-dieunconquerable - not capable of being conquered or vanquished or overcome; "a tribute to his courage...and his unconquerable will"- R.E.Danielson; "faced unconquerable difficulties"