Colossal

Etymology

From the Colossus of Rhodes, a giant bronze statue of the sun god that was one of the Seven Wonders of the ancient world, via Greek "kolossos" (a huge statue) and Latin "colossus." The word carries its origin: something colossal is not just large but statue-large, built to dwarf the human standing before it.

adjective · /kuh-LOSS-ul/
Extraordinarily large or great in scale.
What it names
Bigness on a monumental, awe-inspiring order — the scale of statues and disasters, not merely of big things.
Example
The dam was a colossal undertaking — a decade of work and a city’s worth of concrete.
Related idea
Colossal carries a monumental, statue-scaled grandeur from its origin; plain synonyms like "huge" or "enormous" name size alone, without the sense of an awe-commanding monument.