demurring, excepting, kicking, objecting, protesting, remonstrating

caviling(or cavilling), quibblingchallenging, daring, defying, fightingconflicting, debating, disputing, hassling, quarreling(or quarrelling), squabbling, wranglingbeefing, bellyaching, bitching, bleating, carping, caterwauling, complaining, crabbing, croaking, fussing, griping, grizzling, grouching, grousing, growling, grumbling, grumping, hollering, keening, maundering(chiefly British), moaning, murmuring, muttering, nagging, repining, screaming, squawking, squealing, wailing, whimpering, whinging(or whingeing, British), whining, yammering, yawping(or yauping), yowlingbalking, gagging, stickingcensuring, criticizing, denouncingdisobeying, rebelling, withstandingdemonstrating

taking exception, taking issue

approving, sanctioningacceptingacceding, acquiescing, agreeing, assentingadhering, complying, conforming, following, minding, obeying, observingadvocating, championing, defending, maintaining, supporting, sustaining, upholdingapplauding, cheering, commending