Definify.com
Webster 1913 Edition
Nonplus
Non′plus
,Noun.
A state or condition which baffles reason or confounds judgment; insuperable difficulty; inability to proceed or decide; puzzle; quandary.
Both of them are a perfect
nonplus
and baffle to all human understanding. South.
Non′plusˊ
,Verb.
T.
[
imp. & p. p.
Nonplused
or Nonplussed
; p. pr. & vb. n.
Nonplusing
or Nonplussing
.] To puzzle; to confound; to perplex; to cause to stop by embarrassment.
He has been
nonplused
by Mr. Dry’s desiring him to tell what it was that he endeavored to prove. Spectator.
Webster 1828 Edition
Nonplus
NON'PLUS
,Noun.
NON'PLUS
,Verb.
T.
Your situation has nonplussed me.