challenge Synonyms

take exception gainsay dispute repudiate renitency renitence rencounter suspect remonstration remonstrate requisition resist revendicate summons summon stumper SPAR skepticize roust roun rival remonstrance recalcitrate reluct problem poser outvie outdare oppugnation oppugn opposition oppose protest protestation provocation refute recuse recalcitration rebuttal rebut quiz question query objection main challenge closed book move in on whistlestop take the field call into question