Undependably variable; mercurial or fickle.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "skittish" in a sentence
"Still, shoppers remain skittish about the economic recovery, leaving the retail industry uncertain about the upcoming holiday season."
"Bloomberg News Sales are rising, but companies remain skittish over demand."
"Spirited horses, when not enough exercised, are often called skittish, when it is only play; and some grooms will punish them, but our John did not; he knew it was only high spirits."