Synonyms

vastly

American

[vast-lee, vahst‐] / ˈvæst li, ˈvɑst‐ /

adverb

to an extremely great extent or degree; hugely.

We still have essentially the same brains as early humans, but most of us live in vastly different circumstances than they did.

Other Word Forms

supervastly adverb

Etymology

Origin of vastly

vast ( def. ) + -ly

Vocabulary lists containing vastly

Debbie Reynolds (1932-2016) Tribute List

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The people on her social media feed, including people she loved and trusted, had vastly different views.

From Salon • Apr. 19, 2026

Hugo enjoyed it so much that he decided to include Mandarin as part of his Duke of Edinburgh award as it was "such a vastly different language from English".

From BBC • Apr. 18, 2026

Thanks to technology, the U.S. and South Korea have vastly improved their counterbattery capabilities, meaning they can take out North Korean guns as soon as they start firing.

From The Wall Street Journal • Apr. 10, 2026

"Iran has seen that the US and Israel together have a vastly superior military capability and of course that could create a stronger incentive to pursue nuclear weapons," he said.

From Barron's • Apr. 8, 2026

To make Good Boys work—and to get it to Nebraska—Volpe is going to have to coax performances from actors of vastly different abilities and styles.

From "Drama High" by Michael Sokolove

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023