The duality or state of being obdurate; invincible hardness of heart; obstinacy.
Stubbornness; persistence

1. A fixedness in will, opinion, or resolution that can not be shaken at all, or only with great difficulty; firm and usually unreasonable adherence to an opinion, purpose, or system; unyielding disposition.
2. The quality or state of being difficult to remedy, relieve, or subdue

1. Resolute adherence to one's own ideas or desires; SYN. bullheadedness, obstinacy, obstinance, pigheadedness, self-will.
2. The trait of being difficult to handle or overcome; SYN. obstinacy, obstinance, mulishness.