Learn how to say Unbendable correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word unbend:
verb (past and past participle unbent)
1make or become straight from a bent or twisted form or position:
I had trouble unbending my cramped knees
he unbent from the cockpit
[no object] become less reserved, formal, or strict:
you could be fun too, you know, if you’d only unbend a little
2 [with object] Sailing unfasten (sails) from yards and stays.
untie or cast loose (a rope or cable).