a·ghast

[uh-gast, uh-gahst]
adjective
struck with overwhelming shock or amazement; filled with sudden fright or horror: They stood aghast at the sight of the plane crashing.

Origin:
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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World English Dictionary
aghast (əˈɡɑːst) [Click for IPA pronunciation guide]
 
adj
(postpositive) overcome with amazement or horror
 
[C13: agast, from Old English gæstan to frighten. The spelling with gh is on the model of ghastly]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Aghast is always a great word to know.
So is quincunx. Does it mean:
a scrap or morsel of food left at a meal.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

aghast
mid-13c., agast, "terrified," pp. of M.E. agasten "to frighten," from a- intensive prefix + O.E. gæstan "to terrify," from gæst "spirit, 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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Example sentences
Nuclear experts on both sides of the debate are aghast at such comparisons.
They restored their land to a smooth and fertile beauty but were aghast to hear
  the dragons stirring.
There they watched aghast as the tsunami claimed their town.
Impressed and aghast, the viewer is in for a tumultuous ride.
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