Too much coffee has made this man jittery.
jittery definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Informal having the jitters
jittery definition by American Heritage Dictionary
adjective jit·ter·i·er, jit·ter·i·est
- Having or feeling nervous unease: a jittery vigil in the dark.
- Marked by jittering movements: a jittery ride over rough terrain.
- jitˈter·i·ness noun