appall

Short definition from Wiktionary

Verb

1. 1
   To fill with horror or indignation; to dismay.
2. 2
   To make pale; to blanch.
3. 3
   To weaken; to reduce in strength
4. 4
   To grow faint; to become weak; to become dismayed or discouraged.
5. 5
   To lose flavor or to become stale.