Which preposition to use with artlessness

of Occurrences 10%

I will admit that the school is not as retiring and diffident as formerly; for we are all ready enough to say that no times are egual to our own times; but I shall strenuously protest against your interpretation of the nature and artlessness of an American girl.

in Occurrences 1%

There was a piquancy in her accent that made the hearer wish to hear further, and a certain artlessness in her manner not met with recently by him.

with Occurrences 1%

In it were mingled craft and artlessness with a touch of dignity to make it unassailable.

Which preposition to use with  artlessness