To cause to be overcome with astonishment; astound. 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 "flabbergast" in a sentence
"Emily says the hardest word she had to spell was 'flabbergast'."
"A calm and collected voice spoke over the flabbergast shuttle crew: “About time you came in person.”"
"The ignorance of the American people regarding foreign affairs never continues to flabbergast me."