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

Trump’s personal finances differ vastly from those of other recent presidents. — Steve Kopack, NBC news, 9 Nov. 2026

The game also arrives in a vastly different technological landscape from its predecessor, with newer consoles capable of supporting more elaborate environments and character interactions. — Jonathan Landrum Jr, Chicago Tribune, 9 Nov. 2026

The distinction matters because polynomial and exponential growth can produce vastly different computing demands as the size of a problem increases. — Neetika Walter, Interesting Engineering, 7 Nov. 2026

Without those standards, two developers could fulfill the same commitment through assessments with vastly different levels of rigor and objectivity, leaving businesses and regulators uncertain about how much confidence to place in the results. — Avani Desai, Fortune, 6 Nov. 2026

Word History

First Known Use

1598, in the meaning defined above

Rhymes for vastly

• ghastly
• lastly
• steadfastly