고지식하다

Etymology
The verb was originally a phrase involving the adverb "in a straight way; righteously" and, thus "to act righteously". Early Hangul texts preserve this positive meaning. However, by the late sixteenth century, the verb had eventually shifted to the adjectival "to be self-righteous; to be stubborn".

Once the word had become an adjective and the Old Korean etymology had long been forgotten, it was misunderstood as a corruption of an adjective formed by the adjective-deriving suffix, leading to the modern form via hypercorrection. This began to occur in the sixteenth century, and the original non-hada form had disappeared by the seventeenth century.

Equivalent to modern.

Adjective

 * 1) to be self-righteous; to be stubborn; to be inflexible