Which preposition to use with laxness

in Occurrences 2%

Otherwise, unless the girls are aiming definitely at some professional work after the course, there is a tendency to laxness in attendance, or to the relinquishment of the work in the middle, which tendency is engendered by the nature of the subject.

of Occurrences 2%

This aided that laxness of discipline which permitted Big Jane, Adaline and brother William to attend sometimes, under care of neighbors.

with Occurrences 1%

They liked him for his inexhaustible good-nature, the mellow baritone in which he sang the range songs at any one's request, and perhaps more than all, for the very laxness with which he conducted his work.

Which preposition to use with  laxness