Colossal vs. Gigantic

Of great size, extent, or amount; immense.

Exceedingly large in size, extent, or amount, especially for its kind

Of great scope or consequence; monumental

Very great in scope or importance

Extremely large or on a great scale.

Very large.

Amazingly spectacular; extraordinary; epic.

(slang) Excellent; very good or exciting.

Of enormous size; gigantic; huge; as, a colossal statue.

In the manner of a giant. en

Of a size larger than heroic. See Heroic.

Of extraordinary size; like a giant.

So great in size or force or extent as to elicit awe;

Such as a giant might use, make, or cause; immense; tremendous; extraordinarly; as, gigantic deeds; gigantic wickedness.

So exceedingly large or extensive as to suggest a giant or mammoth;