I. ˌnän-ˈpləs noun
Etymology: Latin non plus no more
Date: 1582
: a state of bafflement or perplexity : quandary
II. transitive verb
( -plussed also non·plused -ˈpləst ; -plus·sing also non·plus·ing -ˈplə-siŋ)
Date: 1591
: to cause to be at a loss as to what to say, think, or do : perplex
Synonyms: see puzzle