significantly (related)
drastically (related)
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largely (related)
massively (related)
considerably (related)
markedly (related)
dramatically (related)
substantially (related)
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immeasurably (related)
(Obs.) Many in number
Find another word for vastly. In this page you can discover 18 synonyms, antonyms, idiomatic expressions, and related words for vastly, like: immensely, enormously, extensively, significantly, prodigiously, tremendously, drastically, hugely, largely, massively and considerably.
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