NONPLUS

nonplus. Nonplus, n. a puzzle; v.t. to puzzle, to confound

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Non″plus (?), n. [[L. non not + plus more, further. See Plural.]] 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.