Which preposition to use with backwardness

of Occurrences 18%

In Malone's correspondence are complaints of the backwardness of the members of the Literary Club 'to pay the amounts nominally subscribed by them.'

in Occurrences 5%

His backwardness in the university hath set him thus forward; for had he not truanted there, he had not been so hasty a divine.

about Occurrences 1%

Sylvia had not the slightest backwardness about explaining.

at Occurrences 1%

As this was declining beforehand all subordinate office, an excessive modesty could hardly have been the cause of his backwardness at this juncture.

on Occurrences 1%

The two squires would infallibly ruin him upon the least appearance of backwardness on his part, as they were accustomed to do every inferior that resisted their will.

with Occurrences 1%

A philosophical treatise is wanting, of the causes of the backwardness with which persons after a certain time of life set about writing a letter.

Which preposition to use with  backwardness