Which preposition to use with unpromising

as Occurrences 2%

No, my poor friend," continued he, addressing the Caterpillar, "disdain you as they may, and unpromising as your aspect certainly is at present, the time is at" hand when you will prank it with the gayest of them all.

in Occurrences 2%

The first khan we visited was too filthy to enter; but the second, though most unpromising in appearance, turned out to be better than it looked.

in Occurrences 1%

Following the course of the inclosure down the opposite slope, we came upon a group of log cabins, low, shabby, and unpromising in their appearance, but a most welcome shelter from the pelting storm.

of Occurrences 1%

Sydney Carton, idlest and most unpromising of men, was his great ally.

to Occurrences 1%

He felt the utmost anxiety regarding his men, among whom the pangs of hunger, upon bodies exhausted by fatigue, must have been working effects most unpromising to his success; and he gave orders, before seeking any repose, that the whole country should now be mercilessly ransacked for the means of refreshment.

for Occurrences 1%

Cossar was a large-bodied man with gaunt inelegant limbs casually placed at convenient corners of his body, and a face like a carving abandoned at an early stage as altogether too unpromising for completion.

from Occurrences 1%

Although the prospect of a pacific adjustment with the new Government was unpromising from the known hostility of its head to the United States, yet, determined that nothing should be left undone on our part to restore friendly relations between the two countries, our minister was instructed to present his credentials to the new Government and ask to be accredited by it in the diplomatic character in which he had been commissioned.

Which preposition to use with  unpromising