vast

1 of 2

adjective

ˈvast 

: very great in size, amount, degree, intensity, or especially in extent or range

vast knowledge

a vast expanse

vastness

ˈvas(t)-nəs 

noun

vast

2 of 2

noun

: a boundless space

the vast of heaven

—John Milton

Synonyms

Adjective

• astronomical
• astronomic
• Brobdingnagian
• bumper
• colossal
• cosmic
• cosmical
• cyclopean
• elephantine
• enormous
• galactic
• gargantuan
• giant
• gigantesque
• gigantic
• grand
• herculean
• heroic
• heroical
• Himalayan
• huge
• humongous
• humungous
• immense
• jumbo
• king-size
• king-sized
• leviathan
• mammoth
• massive
• mega
• mighty
• monster
• monstrous
• monumental
• mountainous
• oceanic
• pharaonic
• planetary
• prodigious
• super
• super-duper
• supersize
• supersized
• titanic
• tremendous
• vasty
• walloping
• whacking
• whopping

Choose the Right Synonym for vast

enormous, immense, huge, vast, gigantic, colossal, mammoth mean exceedingly large.

enormous and immense both suggest an exceeding of all ordinary bounds in size or amount or degree, but enormous often adds an implication of abnormality or monstrousness.

an enormous expense

an immense shopping mall

huge commonly suggests an immensity of bulk or amount.

incurred a huge debt

vast usually suggests immensity of extent.

the vast Russian steppes

gigantic stresses the contrast with the size of others of the same kind.

a gigantic sports stadium

colossal applies especially to a human creation of stupendous or incredible dimensions.

a colossal statue of Lincoln

mammoth suggests both hugeness and ponderousness of bulk.

a mammoth boulder

Examples of vast in a Sentence

Adjective

She has a vast amount of knowledge on this subject.

The policy is supported by the vast majority of citizens.

a vast expanse of land

Recent Examples on the Web

Adjective

By contrast, the vast majority of Iran’s oil exports, which averaged about 1.5 million barrels per day last year, go through the Strait of Hormuz. —Jason Ma, Fortune, 23 June 2025

As a team, the Thunder’s biggest flaw in Game 6 was the vast difference in turnover margin, which Indiana took advantage of. —Scott Thompson, FOXNews.com, 23 June 2025

And Iran could launch some of its vast arsenal of missiles against Israel, though that would risk having many of them shot down by Israel’s Iron Dome defense apparatus. —Josh Meyer, USA Today, 23 June 2025

These powerful stellar explosions serve as cosmic lighthouses, helping astronomers measure vast cosmic distances and understand the accelerating expansion of the universe. —Jamie Carter, Forbes.com, 23 June 2025

Word History

Etymology

Adjective

borrowed from Latin vāstus or vastus "devoid of habitation, desolate, dreary," also, "of great size, immense," probably in part continuing Indo-European *h₁u̯eh₂-sto- (whence Old High German wuosti "empty, deserted," Old English wēste, Old Irish fás), in part conflated with another base *wast- of uncertain origin

Noun

noun derivative of vast entry 1, perhaps by analogy with deep entry 1, deep entry 3

First Known Use

Adjective

1585, in the meaning defined above

Noun

1604, in the meaning defined above

Rhymes for vast

• bast
• blast
• cast
• caste
• classed
• clast
• fast
• gassed
• gast
• glassed
• grassed
• hast

Kids Definition

vast

adjective

ˈvast

: very great in extent, size, amount, degree, or intensity

a vast stretch of desert

vast knowledge

vastly adverb

vastness

ˈvas(t)-nəs

noun