ōga

ōga, m.n: the feeling which is excited in a person, terror, dread, horror, great fear; an object which excites fear, a terrible, horrible thing. (OH-ga / ˈoː-ga)

Medieval manuscript image of a four-faced devil pushing men in a flaming wheelbarrow.
Taymouth Hours. England (London?), 2nd quarter of 14th century. British Library, Yates Thompson 13, f. 139v. [bl.uk]

sweorcan

sweorcan, str.v: (in a physical sense) to become dark, be obscured; (figuratively of mental gloom) to become troubled, gloomy, sad; (of that which causes sadness) to become grievous, troublesome, saddening. (SWEH-or-kahn / ˈswɜɔɹ-kan)