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

The House and Senate ended the week by passing vastly different bills, creating a new impasse as lawmakers leave Washington for a two-week recess. —Kevin Freking, Fortune, 28 Mar. 2026

Palm Sunday's forecast will be vastly different. —Lauren Bostwick, CBS News, 28 Mar. 2026

With clients and readers of his books vastly ranging in demographic, Rojeck is hopeful that anyone, anywhere can gain valuable financial literacy from his teachings. —Madison Beveridge, San Diego Union-Tribune, 27 Mar. 2026

Bolstered by a vastly superior air force and hard-to-overwhelm missile defenses, Israel is more than a match for its enemies, even Iran, and will remain so for a decade or more. —Chicago Tribune, 27 Mar. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly