undauntable C2+

/ʌnˈdɔːntəbəl/ impossible to discourage or intimidate

undauntedly C2+

/ʌnˈdɔːntɪdli/ in a fearless and resolute manner

undauntedness C2+

/ʌnˈdɔːntɪdnəs/ the quality of being fearless and undismayed