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

In the years since, Colorado has vastly improved its forecasting, and there hasn’t been another avalanche death on Highway 550. — Peter Hessler, New Yorker, 28 Sep. 2026

But opponents are still concerned that vastly expanding operations at the existing 80 Merritt Blvd. — Don Stacom, Hartford Courant, 28 Sep. 2026

Metering the new unit of commerce In the AI era, two different users can create vastly different workloads. — Sarita Singh, Fortune, 28 Sep. 2026

Li is famous for creating ImageNet, a vastly large dataset of images which provided the training data for large neural networks, which led to several major developments in AI. — Katie McQue, NPR, 26 Sep. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly