Nonplus is a state of confusion where you don't know what to do, think or say.noun
An example of nonplus is being told to turn right on Fifth Street while approaching the intersection where North Fifth Street is to the left and South Fifth Street is to the right.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Origin: L non, not + plus, more: see plus
Used by arrangement with John Wiley & Sons, Inc.
transitive verb non·plussed also non·plused, non·plus·sing also non·plus·ing, non·plus·ses also non·plus·es
Origin: From Latin nōn plūs, no more : nōn, not; see non- + plūs, more; see pelə-1 in Indo-European roots.