1 : extraordinarily large in size or extent or amount or power or degree; "an enormous boulder"; "enormous expenses"; "tremendous sweeping plains"; "a tremendous fact in human experience; that a whole civilization should be dependent on technology"- Walter Lippman; "a plane took off with a tremendous noise"
2 : extreme in degree or extent or amount or impact; "in a frightful hurry"; "spent a frightful amount of money"
