A state of bewilderment or perplexity.
Nonplus is a state of confusion where you don't know what to do, think or say.
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.
To put at a loss as to what to think, say, or do; bewilder.
To cause to feel indifferent or bored.
A condition of perplexity in which one is unable to go, speak, or act further.
To put in a nonplus; bewilder.