Slantingly

In consequence of this I could only manage to observe that the leaves of the plant are thrown for a few seconds into boiling water, and then placed in flat iron pans, fixed slantingly in stone-work, where they are slightly roasted by a gentle heat, during which process they are continually stirred by hand.

Source: wiktionary

As the clerk spoke he looked slantingly on the page, as a person might do to discover if some writing were dry.

Source: wiktionary

The hammer-handle had struck slantingly across my forehead, and my head ached from the blow.

Source: wiktionary

It was afternoon, and the sun shone slantingly on the waters of the river, above which on the hills amid trees and flowering gardens stood the house of Captain Andrew Brown.

Source: wiktionary