vast

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.

Vast is a related term of unlimited.

As a noun vast

is west (compass point).

As an adjective unlimited is

limitless or without bounds; unrestricted.

Vast is a related term of monstrous.

As a noun vast

is west (compass point).

As an adjective monstrous is

hideous or frightful.

As nouns the difference between vast and accomplishment

is that vast is west (compass point) while accomplishment is the act of accomplishing; entire performance; completion; fulfillment; as, the accomplishment of an enterprise, of a prophecy, etc.