SKITTISH
skittish, flighty, spooky, nervous
(adjective) unpredictably excitable (especially of horses)
Source: WordNet® 3.1
Etymology
Adjective
skittish (comparative more skittish, superlative most skittish)
Easily scared or startled; timid.
Wanton; changeable; fickle
Difficult to manage; tricky.
Synonyms
• (easily scared or startled): spookish, jumpy, skittery, skitterish, squirrelly
Source: Wiktionary
Skit"tish, a. Etym: [See Skit, v. t.]
1. Easily frightened; timorous; shy; untrustworthy; as, a skittish
colt. "A restiff, skittish jade." L'Estrange.
2. Wanton; restive; freakish; volatile; changeable; fickle. "Skittish
Fortune's hall." Shak.
– Skit"tish*ly, adv.
– Skit"tish*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition