Idiosyncratic

In the production of this first volume, Tolkien experienced what became for him a continual problem: printer’s errors and compositor’s mistakes, including well-intentioned ‘corrections’ of his sometimes idiosyncratic usage.

At the time, I set it down to some idiosyncratic, personal distaste, and merely wondered at the acuteness of the symptoms; but I have since had reason to believe the cause to lie much deeper in the nature of man, and to turn on some nobler hinge than the principle of hatred.