adv
vastly
VAST-lee
adv
1
By a very large amount; greatly.
"The new engine is vastly more efficient than the old one."
"Her opinion of the restaurant changed vastly after tasting the dessert."
How to Use Vastly
Learner’s notesIn plain EnglishTo a huge degree.
Common pairings
vastly different
vastly improved
vastly superior
Word Forms
more vastly comparative, most vastly superlative
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The new engine is _____ more efficient than the old one.
Etymology
Formed from vast plus the adverb-forming suffix -ly.