imposing(magnificent and impressive because of appearance, size, stateliness or dignity) adjective [UK: ɪm.ˈpəʊz.ɪŋ] [US: ɪmˈpo.ʊz.ɪŋ]Every city has an imposing cathedral. = Ogni città ha una cattedrale imponente.
massive(of great size, significance or import; overwhelming) adjective [UK: ˈmæ.sɪv] [US: ˈmæ.sɪv]The elephant is a massive mammal. = L'elefante è un mammifero imponente.