Skittish

['skɪtɪʃ]

(adj.) unpredictably excitable (especially of horses) .

Typed by Leigh--From WordNet

(v. t.) Easily frightened; timorous; shy; untrustworthy; as, a skittish colt.

(v. t.) Wanton; restive; freakish; volatile; changeable; fickle.

Editor: Maris

a. Shy (as a horse), timid, timorous, easily frightened.

Checked by Clive

adj. unsteady light-headed easily frightened: hasty volatile changeable: wanton.—adv. Skitt′ishly.—n. Skitt′ishness.

Editor: Marilyn

Lady Tippins with a skittish little scream, attracts the general attention. Charles Dickens. Our Mutual Friend.
Haley's horse, which was a skittish young colt, winced, and bounced, and pulled hard at his halter. Harriet Beecher Stowe. Uncle Tom's Cabin.

Editor: Marilyn