unfaltering

(s) marked by firm determination or resolution; not shakable
- firm convictions
- a firm mouth
- steadfast resolve
- a man of unbendable perseverence
- unwavering loyalty
firm, steadfast, unbendable, unshakable, unwavering, steady, stiff,

Synonyms

firm steadfast unbendable unshakable unwavering steady stiff

Words of close approximity

unfalteringly