skittish Look up skittish at Dictionary.com
c.1412, "very lively, frivolous," perhaps from Scand. base *skyt- (stem of O.N. skjuta "to shoot"), from PIE base *skeud- "to shoot, to chase, to throw, to project" (see shoot (v.)). Sense of "apt to run" first recorded about 1510, of horses.