Synonyms to be diffident

challenge, Socratic method, affront, arouse, ask, ask for, asking, attack, awake a doubt, awaken, baffle, balk, banter, battle cry, be contrary to, be doubtful, be dubious, be skeptical, be uncertain, beard, beef, belie, bestir, bid defiance, bid to combat, bitch, blackmail, blast, boggle, boycott, brave, breast, bring before, bring forward, bring up, bringing into question, bucking, call, call for, call in question, call into question, call out, calling, cartel, catechetical method, catechization, catechizing, checkmate, circumvent, claim, claiming, clamor for, combative reaction, compete, compete with, complain, complain loudly, complaint, compunction, confound, confront, confront with, confrontation, contend with, contention, contest, contradict, contradiction, contravention, contraversion, controvert, cope, counter, counteract, counteraction, countermand, counterwork, counterworking, cross, crosscurrent, crossing, cry for, cry out against, dare, dash, declaration of war, declare war, defeat, defi, defiance, defy, demand, demanding, demonstrate, demonstrate against, demonstrat