disillusion(act or state of disenchanting or freeing from a false belief) noun [UK: ˌdɪ.sɪ.ˈluːʒ.n̩] [US: ˌdɪ.sə.ˈluːʒ.n̩]
disillusionment [disillusionments](feeling that arises from the discovery that something is not what it was anticipated to be) noun [UK: ˌdɪ.sɪ.ˈluːʒn.mənt] [US: ˌdɪ.sə.ˈluː.ʒən.mənt]