"Disillusionment" means the feeling of disappointment or loss of hope that occurs when someone realizes that their beliefs or expectations were not true or realistic. Full definition
Even then, one has problems like the inability to count people who do not register to vote because of disillusionment with the system. (politics.stackexchange.com)
No wonder why gamification as a concept is going down to the Trough of Disillusionment in the Gartner's Hype Cycle. (elearningindustry.com)
And in a third sign of growing disillusionment with Cuomo by Democrats and others on the political left, Working Families Party activists, furious over Cuomo's alliance with Senate Republicans, are threatening to back someone other than the governor in the November election, a move that would aid GOP gubernatorial contender Rob Astorino, sources said. (nypost.com)