verb (used with object)
to fill or overcome with horror, consternation, or fear; dismay: He was appalled by the damage from the fire. I am appalled at your mistakes.
Also, appal.

1275–1325; Middle English < Middle French ap(p)allir to grow or make pale, equivalent to a- a-5 + pal(l)ir in same sense; see pale1

horrify, daunt. See frighten. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
appal or (US) appall (əˈpɔːl)
vb , (US) -pals, -palling, -palled, -palls, -palling, -palled
(tr) to fill with horror; shock or dismay
[C14: from Old French appalir to turn pale]
appall or (US) appall
[C14: from Old French appalir to turn pale]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c., from O.Fr. apalir "become or make pale," from a- "to" + palir "grow pale," from L. pallere (see pallor). Meaning of "cause dismay or shock," is 16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It should appall wine snobs, beer swillers and even teetotalers.
Many other things were going on in society then that would appall us today.
He lives to glorify the human body and appall the bourgeoisie.
Each of the guest rooms is radically different in its decor and theme, and each
  may delight or appall you with its quirks.
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