To fill with sudden wonder or amazement. See Synonyms at surprise.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "astonish" in a sentence
"He hid himself, and worked always to astonish, which is an egotism, and therefore little."
"The Brits must use "astonish" differently than do Yanks."
"He was far more inspired by avant-garde photographers such as Harper's Bazaar art director Alexey Brodovitch -- who instructed his students to "astonish" him -- not to mention the free-form improvisations of abstract expressionist painters, new American jazz and the Beat poets, all commingling in New York at the time."