Which preposition to use with unassuming

in Occurrences 5%

His colleaguethe Rev. J. Pykeis a small, mild gentleman, unassuming in manner, cautious, careful, quiet, precise, and, whilst attending to his duties regularly, he makes no bluster about them.

as Occurrences 2%

John spoke to everyone with the greatest charity and kindness; his manner was modest and unassuming as that of a child, and he seemed to fear receiving praise.

to Occurrences 2%

Insistent questioning did develop, further, that "cold tea" was one of these; but cold tea did not make plain its recondite potenciesdid not explain why a beverage so unassuming to the taste should inspire one with a wish to partake of it continuously.

Which preposition to use with  unassuming