Wordnet 3.0
ADJECTIVE (1)
1. 
 marked by firm determination or resolution; 
 not shakable; 
- Example: "firm convictions"- Example: "a firm mouth"- Example: "steadfast resolve"- Example: "a man of unbendable perseverence"- Example: "unwavering loyalty"[syn: firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering]
WordNet (r) 3.0 (2006):
unbendable
    adj 1: marked by firm determination or resolution; not shakable;
           "firm convictions"; "a firm mouth"; "steadfast resolve";
           "a man of unbendable perseverence"; "unwavering loyalty"
           [syn: firm, steadfast, steady, stiff,
           unbendable, unfaltering, unshakable, unwavering]