Wiktionary
Etymology 1 a. 1 Pertaining to something or someone else; different. 2 Pertaining or directed toward others; otherish. Etymology 2
adv. (context nonstandard English) otherwise; differently.
Usage examples of "otherly".
How is it that your pattern of acting is otherly from his, when by the laws of luck you started out with much the same forebearish make-up?
The thought of a Returned grasping anything except to swallow it was alien, Otherly, bewitched.
It was alien and otherly, and when he ventured in curiosity to ease the awful thing even a little way from its sheath, he found strange letters, the blade itself like a shard of glass—even touching it threatened injury.
And she'd watched Chur go thin and otherly and sometimes as sensible as gtsta, when she was tracking something.