To Nónplus. v.a. [from the noun.] To be confound; to puzzle; to put to a stand; to stop.
Nor is the composition of our own bodies the only wonder; we are as much nonplust by the most contemptible worm and plant. Glanv. Scept. c. viii.
His parts were so accomplisht,
That right or wrong he ne'er was nonplust. Hudibras.
That sin that is a pitch beyond all those, must needs be such an one as must nonplus the devil himself to proceed farther. South.
What, you are confounded, and stand mute?
Somewhat nonplust to hear you deny your name. Dryden.
Tom has been cloquent for half an hour together, when he has been nonplused by Mr. Dry's desiring him to tell what it was that he endeavoured to prove. Spect. 471.