Which preposition to use with shyer

than Occurrences 4%

And yet, shyer than gravitation, less to be counted on than the fluxions of sun-dials, stealthier than the growth of a forest, are the footsteps of Christianity amongst the political workings of man.

of Occurrences 2%

"This cannot fail to make us shyer of yielding our assent.

Which preposition to use with  shyer