unbendable

(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, unfaltering, unshakable, unwavering, steady, stiff,

Synonyms

firm steadfast unfaltering unshakable unwavering steady stiff

Words of close approximity