vastly

As an adverb vastly

is greatly, in a vast manner.

As an adjective undefined is

lacking a definition or value.

As adverbs the difference between massively and vastly

is that massively is in a massive manner, in a way that appears large, heavy or imposing while vastly is greatly, in a vast manner.

As adverbs the difference between vastly and totally

is that vastly is greatly, in a vast manner while totally is entirely; completely.

As an adverb vastly

is greatly, in a vast manner.

As a noun vas is

a vessel or duct transporting any bodily fluid, such as blood, lymph, chyle, or semen.

As adverbs the difference between vastly and radically

is that vastly is greatly, in a vast manner while radically is in a radical manner; fundamentally; very.

Very is a synonym of vastly.

As adverbs the difference between vastly and very

is that vastly is greatly, in a vast manner while very is to a great extent or degree; extremely; exceedingly.

As an adjective very is

true, real, actual.

As an adjective large

is of considerable or relatively great size or extent.

As a noun large

is (music|obsolete) an old musical note, equal to two longas, four breves, or eight semibreves.

As an adverb vastly is

greatly, in a vast manner.

As adverbs the difference between vastly and broadly

is that vastly is greatly, in a vast manner while broadly is in a wide manner, liberally, in a loose sense.

As adverbs the difference between amazingly and vastly

is that amazingly is in an amazing manner; in a way that causes amazement; wonderfully while vastly is greatly, in a vast manner.

As adverbs the difference between vastly and significantly

is that vastly is greatly, in a vast manner while significantly is in a significant manner or to a significant extent.