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Definition of nonplus : 1. A state or condition which daffles reason or confounds judgment; insuperable difficalty; inability to proceed or decide; puzzle; quandary.
2. To puzzle; to confound; to perplex; to cause to stop by embarrassment.

Synonyms:

fetch, agitate, pay back, bilk, mortify, set out, cross, find, mystify, generate, position, make, amaze, rattle, discomfit, dumbfound, bother, lay, vex, flummox, shake up, bunk, faze, sting, baffle, cleave, let, perplex, beat, arrive, abash, spoil, convey, bring, commove, beat out, father, stick to, bind, wash up, astound, flap, devil, trounce, contract, overreach, scotch, place, stir up, outsmart, bewilder, chafe, drum, confound, frustrate, produce, nark, bring forth, get, develop, irritate, throw, stick, go, set, take, arrest, disturb, grow, draw, cohere, besot, cause, set about, stay put, deposit, wedge, beat up, raise up, stick by, stand by, rag, get to, start out, thump, work over, scramble, gravel, tick, experience, affect, exhaust, mother, pound, incur, drive, bemuse, engender, discombobulate, present, fix, model, come, rile, study at confuse, confuse, get down, astonish, suffer, annoy, puzzle, nettle, put, bond, vanquish, commence, shell, obtain, knowledge, stupefy, put someone at a loss, impersonate, buzz off, outwit, stimulate, pay off, scram, disconcert, complicate, aim, personate, posture, become, ticktock, regulate, acquire, start, thwart, begin, tucker, discountenance, sustain, tucker out, stick around, worry, lodge, induce, sit, circumvent, get under one's skin, quiver, pulsate, stump, get at, stay, beget, cling, ticktack, outfox, bugger off, adhere, foil, pose, capture, fluster, hold fast, sire, stun, thrum, crush, have, receive, catch

Usage examples:

• The attentive reader will recollect that certain freebooting Swedes had become very troublesome in this quarter in the latter part of the reign of William the Testy, setting at naught the proclamations of that veritable potentate, and putting his admiral, the intrepid Jan Jensen Alpendam, to a perfect nonplus. - "Knickerbocker's History of New York, Complete", Washington Irving.
• Tom Ryfe, for once, was at a nonplus. - "M. or N. "Similia similibus curantur."", G.J. Whyte-Melville.
• But it must needs be condemned, because it renders the character of the term ambiguous, and is such a grammatical difficulty as puts the parser at a dead nonplus. - "The Grammar of English Grammars", Goold Brown.