Which preposition to use with confusedness

of Occurrences 2%

His lordship thus concludes his epistle; 'It is near three o'clock in the morning, I have been hard at work all day, and am not yet enough recovered to bear much fatigue; excuse therefore the confusedness of this scroll, which is only from Harry to Matt, and not from the secretary to the minister.

Which preposition to use with  confusedness