appalling
/əˈpɔːlɪŋ/verb
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To fill with horror; to dismay.
"The evidence put forth at the court appalled most of the jury."
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To make pale; to blanch.
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To weaken; to reduce in strength
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To grow faint; to become weak; to become dismayed or discouraged.
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To lose flavour or become stale.
Synonyms:
affright, daunt, depress, dismay, frighten, scare, terrify
adjective
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Horrifying and astonishing.
"That was an appalling waste of money."
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Extremely bad; terrible
Synonyms:
awful, grotesque, hideous, horrid, terrible