Etymology: (1575–85; (n.) < L nōn plūs lit., not more, no further, i.e., a state in which nothing more can be done)
Definition of 'nonplus'
Princeton's WordNet
1. (verb)perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze, dumbfound be a mystery or bewildering to "This beats me!"; "Got me--I don't know the answer!"; "a vexing problem"; "This question really stuck me"
Definition of 'nonplus'
Webster Dictionary
1. (noun)nonplus a state or condition which daffles reason or confounds judgment; insuperable difficalty; inability to proceed or decide; puzzle; quandary
Definitions of nonplus 
