delirium [deliriums](mental state of confusion) noun [UK: dɪ.ˈlɪ.rɪəm] [US: də.ˈlɪ.riəm]In the throes of delirium, John claimed that he was not John, but the king of Spain. = En medio del delirio, John afirmó que no era John, sino el rey de España.
delusion [delusions](state of being deluded or misled) noun [UK: dɪ.ˈluːʒ.n̩] [US: də.ˈluːʒ.n̩]My grandpa is under the delusion that we're still at war. = Mi abuelo vive con el delirio de que aún estamos en guerra.
delirio de grandeza noun {m}
delusion of grandeur(False belief that one is important or powerful) noun [UK: dɪ.ˈluːʒ.n̩ əv ˈɡræn.dʒə(r)] [US: də.ˈluːʒ.n̩ əv ɡræn.ˈduːr]