Which preposition to use with unfathomable

as Occurrences 5%

She dropped her hands and looked at him, her face as white as a dead girl's, her eyes as unfathomable as a maniac's.

in Occurrences 2%

He looked up again at Avery with something unfathomable in his eyes.

about Occurrences 1%

There was something unfathomable about him, something that nevertheless arrested her at the very height of her fury.

by Occurrences 1%

After saying that the nineteenth-century Englishman would be but too likely to be repelled if he only skimmed the book, I went on: "With telescope and with microscope, with scalpel and with battery, Western Science interrogates nature, adding fact to fact, storing experience after experience, but coming ever to gulfs unfathomable by its plummets, to heights unscalable by its ladders.

of Occurrences 1%

The fog had risen, and the town and river were steeped in its thick, gray damp; but overhead, the sun-touched smoke-clouds opened like a cleft ocean,shifting, rolling seas of crimson mist, waves of billowy silver reined with blood-scarlet, inner depths unfathomable of glancing light.

to Occurrences 1%

These reefs are of a coral formation, and are very dangerous to approach at night, from their vicinity being unfathomable to the depth of 170 fathoms; still, however, the surf that constantly breaks upon them may be heard at a great distance, and will generally be sufficient to warn the navigator of his danger.

Which preposition to use with  unfathomable