unbendable

Adjective
  1. Marked by firm determination or resolution;
    Not shakable (synset 301997735)
    "firm convictions"; "a firm mouth"; "steadfast resolve"; "a man of unbendable perseverence"; "unwavering loyalty"
    similar to: resolute - firm in purpose or belief; characterized by firmness and determination
    same as: firm, steadfast, steady, stiff, unfaltering, unshakable, unwavering

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