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
Love words? Need even more definitions?Merriam-Webster unabridged
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