Cark

cark \ˈkärk\ intransitive verb: 1. to be filled with worry
transitive verb: to bring worry, vexation or anxiety
noun: 1. a noxious or corroding worry, 2. the state of being filled with worry

Etymology: Norman French carquier, Latin carricare charge, from carrus wagon

I was introduced to this word through Thomas Hardy’s Far from the Madding Crowd.