causing dismay or horror: an appalling accident; an appalling lack of manners.

1810–20; appall + -ing2

appallingly, adverb
unappalling, adjective
unappallingly, adverb Unabridged


verb (used with object), appalled, appalling.


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]

appalling (əˈpɔːlɪŋ)
1.  causing extreme dismay, horror, or revulsion
2.  very bad

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.

1817, prp. adj. formed from appall (q.v.). Colloquial weakened sense of "distasteful" is attested from 1919.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
This statistic has appalling implications.
Your behaviour is appalling.
The real literacy rate in this country is appalling.
Many colleges cite lack of money and poor student preparation as an excuse for
  appalling failure rates.
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