unbendable
1. [ adjective ] marked by firm determination or resolution; not shakable
Synonyms: firm unfaltering unwavering unshakable steady steadfast
Examples:

"firm convictions" "a firm mouth" "steadfast resolve" "a man of unbendable perseverence" "unwavering loyalty"

Related terms: resolute
Similar spelling:   unvendible
  unopened
  unfunded
  unbending
  unbanded
  unavenged
  unappendaged