: struck with terror, amazement, or horror : shocked and upset
was aghast when she heard the news

Did you know?

If you are aghast, you might look like you've just seen a ghost, or something similarly shocking. Aghast traces back to a Middle English verb, gasten, meaning "to frighten." Gasten (which also gave us ghastly, meaning "terrible or frightening") comes from gast, a Middle English spelling of the word ghost. Gast also came to be used in English as a verb meaning "to scare." That verb is now obsolete, but its spirit lives on in words spoken by the character Edmund in William Shakespeare's King Lear: "gasted by the noise I made, full suddenly he fled."

Examples of aghast in a Sentence

The news left her aghast. Critics were aghast to see how awful the play was.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The diplomats assembled in Munich were, expectedly, aghast. Newsweek, 21 Feb. 2025 Those who voted against him — and some who stayed home last November — were aghast. J. David Goodman, New York Times, 21 Feb. 2025 Like Wood, Trump’s pitches seem to fall from the clouds and are leaving opposing Democratic Party hitters on the back foot, aghast, mouths agape. Laura Washington, Chicago Tribune, 12 Feb. 2025 Ordinary Syrians like Hamed and Walaa are aghast as the scale of their criminal cruelty continues to be revealed. Scott Peterson, The Christian Science Monitor, 31 Jan. 2025 See All Example Sentences for aghast

Word History

Etymology

alteration (with h after ghastly, ghost entry 1) of Middle English agast, from past participle of agasten "to frighten, become frightened," from a-, perfective prefix + -gasten "to frighten," — more at abide, gast

Note: Oxford English Dictionry, third edition, sees agasten as formed with Middle English gasten, though this verb is not attested until more than a century later, suggesting that gasten may have been formed by dropping the prefix from agasten. Old English gǣstan is attested only once, in Cynewulf's Juliana, and the sense appears to be closer to "afflict" than "frighten." The prefix a- in the modern adjective aghast has presumably been construed as a- entry 1.

First Known Use

13th century, in the meaning defined above

Time Traveler
The first known use of aghast was in the 13th century

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Cite this Entry

“Aghast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aghast. Accessed 3 Mar. 2025.

Kids Definition

aghast

adjective
: struck with terror, amazement, or horror

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