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

Attorneys for plaintiffs in the case say Hochman is vastly overstating the level of fraud and relying on databases with faulty information about who was incarcerated in county custody as a juvenile. — Rebecca Ellis, Los Angeles Times, 26 June 2026

More recently, mathematicians have been able to adapt Erdős’ method to get better estimates of Ramsey numbers where the forbidden cliques differ vastly in size. — Leila Sloman, Quanta Magazine, 26 June 2026

An uncontrollable laugh when tickled is vastly different from a polite laugh in a meeting, an infectious laugh during a movie, or a nervous little giggle after making a mistake. — Laura Baisas, Popular Science, 25 June 2026

While each incident is vastly different, all could be frightening for passengers planning to fly as America rings in its 250th anniversary. — Alexandra Skores, CNN Money, 25 June 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly