vastly

adverb

vast·​ly ˈvast-lē 

: 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

Synonyms of vastly

• extremely
• incredibly
• very
• highly
• terribly
• too
• greatly
• severely
• badly
• so
• far
• damned
• wildly
• damn
• really
• desperately
• heavily
• much
• seriously
• intensely
• immensely

Examples of vastly in a Sentence

the team has vastly improved in the course of the season

vastly underestimated the cost of advertising the new product

Recent Examples on the Web

We are faced with a vastly more consequential version of a Catch-22. —Fintan O’Toole, The New York Review of Books, 25 Apr. 2026

John Lynch and Kyle Shanahan know that having two solid contributors on cheap deals is vastly superior to having one overpriced guy who is statistically no better than the field. —Dieter Kurtenbach, Mercury News, 24 Apr. 2026

Athletes having a vastly smaller everyday social circle is a downside Crowell admits to. —Charles Baggarly, Fort Worth Star-Telegram, 23 Apr. 2026

Preschool offerings differ vastly. —Moriah Balingit, Fortune, 23 Apr. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly