What is a synonym for "vast"?

Common synonyms include: immense, abysmal, ample, amplitudinous, astronomic, astronomical.

Vast

/vɑːst/ adj, noun

adj, noun ·Common ·High school level

Noun

1
A vast space. poetic
"they have seemed to be together, though absent, shook hands, as over a vast, and embraced, as it were, from the ends of opposed winds."
2
Acronym of visual audio sensory theater. abbreviation, acronym, alt-of
3
Acronym of volcanic ash strategic initiative team. abbreviation, acronym, alt-of

Adjective

1
Very large or wide (literally or figuratively).
"The Sahara desert is vast."
2
Very great in size, amount, degree, intensity, or especially extent.
"The exiguity and ſmallneſſe of ſome ſeeds extending to large productions is one of the magnalities of nature, ſomewhat illuſtrating the work of the Creation, and vaſt production from nothing."
3
Waste; desert; desolate; lonely. obsolete
"the empty, vast, and wandering air"

Adjective

1
unusually great in size or amount or degree or especially extent or scope wordnet

"This vast continent is abundant in fossil fuels."

From Middle French vaste, from Latin vastus (“void, immense”). Related to waste and German Wüste.