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

But this time, the 28-year-old right-hander lasted only 2⅔ innings — as long as his scoreless, 34-pitch relief appearance in Game 7 of the World Series last year, but with a vastly different outcome. — Mirjam Swanson, Los Angeles Times, 13 Oct. 2026

Consider two organizations that follow the same regulation but take vastly different amounts of time to reach a conclusion. — Balaji Sreenivasan, Forbes.com, 13 Oct. 2026

As of last year, the US had roughly 10 times more AI data centers than China, according to Stanford University research – and vastly more computing power, other estimates show. — Simone McCarthy, CNN Money, 13 Oct. 2026

Fleet Street The Fleet Street of today looks vastly different from the Fleet Street of 1969. — Jazz Tangcay, Variety, 12 Oct. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly