challenge Synonyms - page 2

puzzle remonstrate reluct refute recuse recalcitration recalcitrate rebuttal rebut react quiz query oppugn strain main challenge take the field call into question go against debunk koan Gordian knot face-off blow out of the water jigsaw destabilize trial run whistlestop move in on closed book major challenge difficult task object to square off showdown shootout recusal recalcitrancy becall disagree with take the bull by the horns assert oneself ask for trouble ask for tickler temptation tax taunt tackle suspect summons