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

Wilson said the towns of Mystic, North Stonington, Norwich and New London would be vastly different without the diverse social and economic contributions of the Eastern Pequot tribe. —Livi Stanford, Hartford Courant, 31 Jan. 2026

The partial government shutdown that started Saturday is vastly different from the record closure in the fall. —Meg Kinnard, Chicago Tribune, 31 Jan. 2026

Speaking of friends, her new novel follows five college friends converging in Palm Springs after leading vastly different lives across the country. —Los Angeles Times, 30 Jan. 2026

Altman reasoned that these economic changes would be the result of AI allowing individuals to be vastly more productive. —Victor Tangermann, Futurism, 29 Jan. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly