obstinacy

A tenacious adhesion to one's own opinion, will; unreasonable insistence on doing things in one's own way; an attitude which often bars the mind against the known truth, and leads to contempt of Divine authority, becoming in the damned absolute immutability in evil. Though relative only during life, its nature differentiates it from sins of frailty, making its direct opposition to God and to grace the special sin against the Holy Ghost.

New Catholic Dictionary

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