Definition of vastly
: to a very great or vast degree or extent : exceedingly
two people with vastly different tastes a vastly more powerful bomb But bluff and bravado … won against potential enemies who vastly outnumbered him.— David Gilmour It was the most eclectic—yet also vastly entertaining—evening of dance I have seen in a long time.— Rita Felciano
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- Which is a synonym of perdure?

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Merriam-Webster unabridged
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Time Traveler for vastly
The first known use of vastly was in 1598
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