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aghast

[uh-gast, uh-gahst] /əˈgæst, əˈgɑst/
adjective
1.
struck with overwhelming shock or amazement; filled with sudden fright or horror:
They stood aghast at the sight of the plane crashing.
Origin of aghast
1225-1275
1225-75; Middle English agast frightened, past participle of agasten, equivalent to a- a-3 + gasten, Old English gǣstan to frighten, earlier *gāstjan < Germanic causative *gaistjan; see ghost
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for aghast

aghast

/əˈɡɑːst/
adjective
1.
(postpositive) overcome with amazement or horror
Word Origin
C13: agast, from Old English gæstan to frighten. The spelling with gh is on the model of ghastly
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for aghast
adj.

c.1300, agast, "terrified," past participle of Middle English agasten "to frighten" (c.1200), from a- intensive prefix + Old English gæstan "to terrify," from gæst "spirit, ghost" (see ghost). The -gh- spelling appeared early 15c. in Scottish and is possibly a Flemish influence, or after ghost, etc. It became general after 1700.

Online Etymology Dictionary, © 2010 Douglas Harper
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