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Adverb: vastly  văst-lee
  1. To an exceedingly great extent or degree
    "He had vastly overestimated his resources"
    - immensely, gigantically, colossally

See also: vast

Nearest

vasopressor
vasosection
Vasotec
vasotomy
vasovasostomy
vasovesiculitis
vassal
vassalage
vast
vastitude
vastly
vastness
VAT
vat
vat color
vat colour
vat dye
vatic
vatical
Vatican
Vatican City