ETYM Cf. French colossal, Latin colosseus. Related to Colossus.
So great in size or force or extent as to elicit awe; SYN. prodigious, stupendous.

ETYM Latin enormis enormous, out of rule; e out + norma rule: cf. French énorme. Related to Normal.
Extraordinarily large in size or extent or amount or power or degree; SYN. tremendous.

ETYM From Gargantua, an allegorical hero of Rabelais.
Characteristic of Gargantua, a gigantic, wonderful personage (from Rabelais); enormous; prodigious; inordinate.
Vast.

Like a giant; extraordinary in size, strength, or power.

ETYM Latin gigas, -antis, giant. Related to Giant.
So exceedingly large or extensive as to suggest a giant or mammoth; SYN. mammoth.

Unusually great in size or amount or degree or especially extent or scope; SYN. immense, vast.

Of very great size

Massively; to a great degree.