vast

As a verb devastate

is to ruin many or all things over a large area, such as most or all buildings of a city, or cities of a region, or trees of a forest.

As a noun vast is

west (compass point).

Vast is a related term of elephantine.

As a noun vast

is west (compass point).

As an adjective elephantine is

.

Unwieldy is a related term of vast.

As an adjective unwieldy

is (obsolete) lacking strength; weak.

As a noun vast is

west (compass point).

Boundless is a related term of vast.

As an adjective boundless

is without bounds, unbounded.

As a noun vast is

west (compass point).

Vast is a related term of monumental.

As a noun vast

is west (compass point).

As an adjective monumental is

in the manner of a monument.

Impressive is a related term of vast.

As an adjective impressive

is making, or tending to make, an impression; having power to impress; adapted to excite attention and feeling, to touch the sensibilities, or affect the conscience; as, an impressive discourse; an impressive scene.

As a noun vast is

west (compass point).

As adjectives the difference between vast and lengthy

is that vast is very large or wide (literally or figuratively) while lengthy is having length; long and overextended, especially in time rather than dimension.

As a noun vast

is a vast space.

As an acronym VAST

is visual audio sensory theater.

Vast is a related term of manifold.

As nouns the difference between vast and manifold

is that vast is west (compass point) while manifold is (now historical) a copy made by the manifold writing process.

As an adjective manifold is

various in kind or quality, diverse.

As an adverb manifold is

many times; repeatedly.

As a verb manifold is

to make manifold; multiply.

Vast is a related term of outspread.

As a noun vast

is west (compass point).

As a verb outspread is

(ambitransitive) to spread out; expand; extend.

As an adjective outspread is

extended outward, as one's arms.

Overweight is a related term of vast.

As nouns the difference between overweight and vast

is that overweight is (chiefly|transport|legal|healthcare) an excess of weight while vast is west (compass point).

As an adjective overweight

is (of a person) heavier than what is generally considered healthy for a given body type and height.

As a verb overweight

is to place excessive weight or emphasis on; to overestimate the importance of.