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WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS

WORDNET DICTIONARY

Verb flummox has 1 sense

• flummox(v = verb.cognition) amaze, baffle, beat, bewilder, dumbfound, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex - 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"
is one way to bedevil, befuddle, confound, confuse, discombobulate, fox, fuddle, throw
Sample sentences:
The bad news will flummox him
The good news will flummox her

OXFORD DICTIONARY

THESAURUS

flummox

abash, addle, addle the wits, baffle, balk, ball up, becloud, bedazzle, befuddle, bewilder, blast, bomb, bother, brave, bug, challenge, checkmate, circumvent, cloud, confound, confront, confuse, contravene, counter, counteract, countermand, counterwork, crap out, cross, dash, daze, dazzle, deceive, defeat, defy, destroy, discombobulate, discomfit, discompose, disconcert, discountenance, dish, dismay, disorganize, disorient, disrupt, disturb, draw a blank, drop a bomb, drop the ball, elude, embarrass, entangle, fan, flop, flurry, fluster, flutter, fog, foil, fold, fold up, fox, frustrate, fuddle, fuss, get left, hoodwink, knock the chocks, lay an egg, lose out, maze, mist, mix up, moider, muddle, mystify, nonplus, not hack it, not make it, perplex, perturb, pother, put out, puzzle, raise hell, rattle, ruffle, ruin, sabotage, scotch, spike, spoil, stonewall, strike out, stump, stymie, take the count, throw into confusion, thwart, unsettle, upset, wash out, whiff

For further exploring for "flummox" in Webster Dictionary Online