(n.) The act of disenchanting, or state of being disenchanted.

about-face awakening backing backsliding ban blackball blackballing complaint debunking dim view disagreement disappointment disapprobation disapproval discontent discontentedness discontentment disesteem disfavor disgruntlement disillusion disillusionment displeasure disrespect dissatisfaction dissent distaste enlightenment exclusion flip-flop indignation lapse low estimation low opinion objection opposition opposure ostracism protest recidivation recidivism reclamation reconversion regress regression rehabilitation reinstatement rejection relapse restitution restoration retrocession retrogradation retrogression retroversion return return to reality returning reversal reverse reversion reverting revulsion rude awakening slipping back thumbs-down turn turnabout undeception unhappiness unspelling