It took less than a single day to change these hairs from a jetty black to white, to weaken my limbs, and to unstring my nerves, so that I tremble at the least exertion, and am frightened at a shadow.
"Selections From Poe"
J. Montgomery Gambrill
If I had, I might ha' whistled for another, for my father wasn't quite so ready to unstring as some other fathers I know of.
"Silas Marner The Weaver of Raveloe"
George Eliot
You are so sympathetic that such things unstring you.
"The Desired Woman"
Will N. Harben