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

With the vastly higher rate of vulnerability identification, Google is worried bad actors will also be able to identify software flaws faster. — Ryan Whitwam, ArsTechnica, 30 July 2026

During his five years as chief executive of Bloomin’ Brands, from 2019 to 2024, shares slipped 15%, vastly underperforming the S&P 500 and rivals like Darden Restaurants and Texas Roadhouse. — Phil Wahba, Fortune, 30 July 2026

Those interviews are cut together with Hosking’s narration, contrasting her experience growing up in the same Upper West Side neighborhood, but within a vastly different racial and social context due to decades of gentrification. — Zac Ntim, Deadline, 30 July 2026

This systemic difference leads to vastly higher capitalization and ticket prices on Broadway, indicating that its financial struggles will continue without significant policy intervention and public funding. — Katie North, Forbes.com, 29 July 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly