verb (used with object), non·plussed or non·plused, non·plus·sing or non·plus·ing.
Origin of nonplus
Examples from the Web for nonplus
"I know of many," he answered, with a smile, an answer which by its simplicity seemed to nonplus the Duke.Love-at-Arms|Raphael Sabatini
Peter was puzzled, and scratched his ear like a man at a nonplus.The Daltons, Volume II (of II)|Charles James Lever
The idea at the bottom of the piece is that the devil will carry off the wee boy if he can nonplus him.
Mr. and Mrs. Accleton were at somewhat of a nonplus as to the most feasible means of procuring the attendance of Sally.Pencil Sketches|Eliza Leslie
The renegade was a little at a nonplus, as he never had undergone the operation which he had described.The Pacha of Many Tales|Frederick Marryat