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

That’s not likely, which means the next city election will be vastly more expensive. —Steve Bousquet, Sun Sentinel, 21 Feb. 2026

Friday wasn’t an exception, but both teams are vastly different in 2026, especially the Mavericks — who once relied on Luka Doncic and Kyrie Irving, but have since passed the baton of the franchise to Cooper Flagg. —Mike Curtis, Dallas Morning News, 21 Feb. 2026

Years of being siloed under vastly disproportionate power. —Literary Hub, 20 Feb. 2026

These men are vastly different. —Gail Sheehy, Vanity Fair, 20 Feb. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly