delusion [delusions](that which is falsely or delusively believed or propagated; false belief; error in belief) noun [UK: dɪ.ˈluːʒ.n̩] [US: də.ˈluːʒ.n̩]
hersenschimsubstantief {m}
will o' the wisp(delusionary goal) noun [UK: wɪl ˈəʊ ðə wɪsp] [US: wɪl ˈoʊ ðə ˈwɪsp]