huge, immense, vast, Brobdingnagian (adj)

unusually great in size or amount or degree or especially extent or scope

"huge government spending"; "huge country estates"; "huge popular demand for higher education"; "a huge wave"; "the Los Angeles aqueduct winds like an immense snake along the base of the mountains"; "immense numbers of birds"; "at vast (or immense) expense"; "the vast reaches of outer space"; "the vast accumulation of knowledge...which we call civilization"- W.R.Inge

immense (Adjective)

huge, gigantic, very large