unfaltering

US /ʌnˈfɑːl.t̬ɚ.ɪŋ/
UK /ʌnˈfɑːl.t̬ɚ.ɪŋ/
"unfaltering" picture
1.

not faltering; firm or steadfast

:
Her unfaltering determination led her to success.
He showed unfaltering loyalty to his team.