Vast
adjective
Definition
1. (adjective) Extremely large in size, area, or extent — much bigger than what you'd normally expect.
2. (adjective) Extremely large in amount, number, or degree — used for differences, quantities, or collections.
2. (adjective) Extremely large in amount, number, or degree — used for differences, quantities, or collections.
Context Alive
You've been driving through the Australian outback for five hours and there's still nothing around you — no buildings, no people, no trees. Just flat, red earth stretching to the horizon in every direction. Your friend looks out the window and says: "I knew Australia was big, but I didn't expect it to feel this vast. It's like the land never ends." You nod and check the GPS — the next town is still three hours away.
Meanings
2 meanings 1 Extremely Large in Size or Area (Adjective) Very Common ▼
This meaning is about physical size — something so big that it's hard to fully take in or comprehend. Imagine standing on the edge of the Grand Canyon for the first time and looking down — the space is so vast that your brain struggles to process the scale. This is describing something that makes you feel small because of how enormous it is. You might read "the vast Sahara Desert stretches across eleven countries" in a geography book, or someone could say "the ocean looked vast and empty from the boat" about being far out at sea with nothing in sight. Or think about walking into a vast cathedral where the ceiling is so high above you that your footsteps echo for seconds. The word suggests size that goes beyond big — it's the kind of scale that makes you stop and stare.
✏️ Vast is stronger than "big" or "large" but less dramatic than "infinite" or "endless." It's perfect for describing landscapes, oceans, deserts, and spaces that make you feel small. You'll see it a lot in travel writing, nature documentaries, and descriptions of the universe.
2 Extremely Large in Amount or Degree (Adjective) Very Common ▼
This meaning is about quantities, numbers, or differences that are far bigger than normal. Imagine two job candidates — one has twenty years of experience and the other has six months. The gap between them is vast. This is describing something measurable that's impressively or surprisingly large in scale. You might hear "the vast majority of people agreed" when almost everyone in a survey said the same thing, or someone could say "there's a vast difference between knowing the theory and doing the job" about the gap between learning and practice. Or think about a company that has a vast collection of customer data — millions and millions of records. The word suggests a quantity or degree that's significantly more than you'd expect.
✏️ "The vast majority" is one of the most common collocations in English — you'll hear it in news, politics, and everyday conversation. It means "almost all" or "the overwhelming majority." "A vast amount of" and "vast numbers of" are also very frequent. These are worth learning as fixed phrases.
Common Patterns
Basic Structures
vast + noun → the standard pattern — directly describing something extremely large
The country has vast reserves of oil beneath the desert.
the vast majority of → almost all — an overwhelming proportion
The vast majority of students passed the exam on their first attempt.
a vast amount / number of → an extremely large quantity
A vast amount of money was spent on the project with very little result.
Common Structures
vast difference / gap between → an extremely large gap between two things
There's a vast difference between what he says and what he actually does.
vast expanse of → a huge, open stretch of land, water, or space
From the plane, you could see the vast expanse of forest below.
vastly + adjective / adverb → adverb form — by a huge margin
The sequel was vastly better than the original film.
Collocations
10 collocationsvast majority
almost all — the overwhelming majority of a group
vast amount
an extremely large quantity of something
vast difference
an enormous gap between two things
vast expanse
a huge, open area stretching far in every direction
vast landscape
a wide, open stretch of land
vast resources
an enormous supply of materials, money, or people
vast knowledge
an extremely wide and deep understanding of something
vast collection
a very large number of items gathered together
vast network
an extremely large and widespread system of connections
vast improvement
a huge, very noticeable positive change
Example Sentences
10 examples
1
The vast majority of people support the new recycling policy.
Almost everyone is in favour of the new recycling rules.
2
The desert stretched out in a vast, empty plain with no sign of life.
The desert was an enormous, lifeless flat stretching as far as the eye could see.
3
There's a vast difference between being busy and being productive.
There's a huge gap between having a lot to do and actually getting things done.
4
The museum holds a vast collection of ancient Egyptian artefacts.
The museum has an enormous number of objects from ancient Egypt.
5
A vast amount of data is generated every single second on the internet.
An incredible quantity of information is created online every second.
6
From the mountain top, we could see the vast expanse of forest below.
Standing on the peak, the endless stretch of forest spread out beneath us.
7
His knowledge of history is vast — he can talk about any period in detail.
He knows an enormous amount about history — ask him about any era and he'll have a detailed answer.
8
The new system is a vast improvement over the old one.
The new system works so much better than the previous one — the difference is huge.
9
She inherited a vast fortune from her grandmother and donated most of it.
Her grandmother left her an enormous amount of money, and she gave the majority away.
10
The universe is so vast that our planet is barely a speck of dust in comparison.
The universe is so impossibly large that Earth is almost nothing compared to it.
Synonyms & Antonyms
6 items
Synonymsenormous
very similar in strength — works for both size and amount
immense
slightly more formal — emphasises impressive, overwhelming scale
huge
more casual and everyday — the most common alternative
Antonymstiny
the direct opposite — extremely small in size
minimal
the opposite for amounts — very small, barely noticeable
narrow
the opposite for gaps or differences — small and limited