Aslant

[ə'slɑːnt] or [ə'slænt]

(adj.) having an oblique or slanted direction .

(adv.) over or across in a slanting direction.

Checker: Nicole--From WordNet

(adv. & a.) Toward one side; in a slanting direction; obliquely.

(prep.) In a slanting direction over; athwart.

Editor: Lou

ad. Obliquely, askance, askew, aslope.

a. Oblique, inclined, slanting.

Checker: Rowena

adj. or adv. obliquely.—Also Asklent′ (Scot.).

Checker: Myrna

He had assumed a bantering air: a light, half-caressing, half-ironicshone aslant in his eye. Charlotte Bronte. Villette.
First let me rule your book, for you always contrive to draw the lines aslant. Charlotte Bronte. Shirley.

Checker: Myrna