Synonym: immensely. Similar words: ghastly, costly, mostly, vast, bristly, honestly, priestly, modestly. Meaning: ['vɑːstlɪ] 
adv. to an exceedingly great extent or degree.
adv. to an exceedingly great extent or degree. 211. That came from seeing people undersell his abilities and calling him vastly overrated and whatnot.
More similar words: ghastly, costly, mostly, vast, bristly, honestly, priestly, modestly, unjustly, earnestly, castle, devastate, devastation, devastating, castle in the air, carry coals to Newcastle, plaster cast, vase, canvas, vassal, canvass, evasive, evasion, crevasse, pervasive, vascular, invasion, invasive, pervasion, canvassing.