This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Alternative spelling of appall.

To grow pale or become dim.

To become weak in quality, or faint in strength; fade; fail; decay.

To become faint-hearted; lose courage or resolution; become dismayed.

To become weak, flat, stale, and insipid; lose flavor or taste, as fermented liquor.

To make pale; cause to grow pale; blanch.

To cause to become weak or to fail; weaken; reduce.

To deprive of courage or strength through fear; cause to shrink with fear; confound with fear; dismay; terrify: as, the sight appalled the stoutest heart.

To cause to become weak, flat, or stale, or to lose flavor or taste, as fermented liquor.

n. A state of terror; affright; dismay; consternation.

v. strike with disgust or revulsion

v. fill with apprehension or alarm; cause to be unpleasantly surprised

"Latest to appal the easily appalled is a selection of T-shirts, designed to increase Nike's share of the action sports market."

disgust    revolt    nauseate    sicken    churn up   

appalled    appalling   

frightful    terrify    startle    horrid    terrific    intolerable    sicken    astound    shameful    dire