Enormous

1. Very great in size, extent, number, or degree.

2. Archaic Very wicked; heinous.

Synonyms: These adjectives describe what is extraordinarily large. Enormous suggests a marked excess beyond the norm in size, amount, or degree: an enormous boulder.
Immense refers to boundless or immeasurable size or extent: immense pleasure.
Huge especially implies greatness of size or capacity: a huge success.
Gigantic refers to size likened to that of a giant: a gigantic redwood tree.
Colossal suggests a hugeness that elicits awe or taxes belief: a colossal ancient temple.
Mammoth is applied to something of unwieldy hugeness: "mammoth stone figures in . . . buckled eighteenth-century pumps, the very soles of which seem mountainously tall" (Cynthia Ozick).
Tremendous suggests awe-inspiring or fearsome size: ate a tremendous meal.
Stupendous implies size that astounds or defies description: "The whole thing was a stupendous, incomprehensible farce" (W. Somerset Maugham).
Gargantuan especially stresses greatness of capacity, as for food or pleasure: a gargantuan appetite.
Vast refers to greatness of extent, size, area, or scope: "Of creatures, how few vast as the whale" (Herman Melville).