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 more Republicans suggested that the $5000 was on the way, paid for by tariffs – though the cost of the checks would vastly outstrip what the government had collected. — David Weigel, semafor.com, 11 Sep. 2026

One of barely a handful of players whose fame and social media followings vastly outstrip their own club’s profile and, in some cases, rivals that of title-winning Women’s Super League (WSL) counterparts. — Katie Whyatt, New York Times, 10 Sep. 2026

The film is a Nigerian-German co-production and follows two sisters, Ade and Titi Ajayi, in 1990s Southwestern Nigeria, who lead vastly different lives under the shadow of their late father’s home. — Zac Ntim, Deadline, 9 Sep. 2026

Other biological rhythms, such as movement or breathing, could also help set the pace of animal communication—leaving open how vastly different species arrive at similar tempos. — Anirban Mukhopadhyay, Scientific American, 7 Sep. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly