1non·plus
noun \ˌnän-ˈpləs\
Definition of NONPLUS
: a state of bafflement or perplexity : quandary
Origin of NONPLUS
Latin non plus no more
First Known Use: 1582
2nonplus
verb
nonplussed also nonplused nonplus·sing also nonplus·ing
Definition of NONPLUS
transitive verb
: to cause to be at a loss as to what to say, think, or do : perplex
Examples of NONPLUS
- <I was nonplussed by his openly expressed admiration of me.>
First Known Use of NONPLUS
1591