Learn how to say Nonplussing correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word nonplus:
verb (nonplusses, nonplussing, nonplussed)
surprise and confuse (someone) so much that they are unsure how to react:
Diane was nonplussed by such an odd question
a state of being very surprised and confused:
reduced to a perfect nonplus, he rose from his chair
late 16th century: from Latin non plus ‘not more’. The noun originally meant ‘a state in which no more can be said or done’