From Longman Dictionary of Contemporary Englishunshakeableun‧shake‧a‧ble, unshakable /ʌnˈʃeɪkəbəl/ adjective BELIEVEan unshakeable faith, belief etc is very strong and cannot be changed or destroyed
Examples from the Corpus
unshakeable• Most people believe what they are told most often, and the myth has become unshakeable.• This was a principle based on unshakeable authority.• They both have an unshakeable confidence in the rightness of their own opinions.• It filled his enemies with terror and his own troops with unshakeable faith and unquenchable blood lust.• She'd paid bitterly and dearly for her unshakeable loyalty.• Only Lewis, unshakeable symbol of dependability, stays his old self.• That can only happen properly if the fundamental, unshakeable understanding of Engineering is soundly built. 