Which preposition to use with unmindful

of Occurrences 194%

it was reserved for our day and generation to gabble them over unthinking, carelessly unmindful of the fearful fate the words describe.

at Occurrences 1%

And he must be lost to all just sense of high duties of his station, if he does not conduct himself with an exclusive devotion to the good of the whole people, unmindful at once of the blandishments of courtiers, who seek to deceive him, and of partizans, who aim to govern him, and thus accomplish their own selfish purposes."

Which preposition to use with  unmindful