Titanic
Etymology
From the Titans, the elder race of Greek gods — among them Cronus and Atlas — who ruled before being overthrown by Zeus and the Olympians in a cataclysmic war. Their name became the adjective for anything of colossal scale or might. The famous ocean liner was named for exactly this sense, before the word acquired its ironic afterlife.
adjective · /ty-TAN-ik/
Of enormous size, strength, or power.
What it names
Vastness with a sense of raw, elemental force — use it for struggles, efforts, or forces that are immense and primal, not merely large.
Example
The two firms were locked in a titanic struggle for control of the market.
Related idea
Gigantic simply means very large; titanic adds an overtone of elemental power and epic conflict, fitting forces and clashes more than mere objects.