Swartly

adv. rare. [f. as prec. + -LY².] So as to be or become swart; swarthily.

1582.  Stanyhurst, Æneis, IV. (Arb.), 111. When she the gift sacrifice with the incense burned on altars … thee moysture swartlye was altred.

1607.  Puritan, IV. ii. 16. How do’s hee looke…? very swartlie, I warrant, with black beard, scorcht cheekes, and smokie eyebrowes.