noun terror; dismay.
2. appall ·vi to lose flavor or become stale.
3. appall ·adj to make pale; to blanch.
4. appall ·vi to grow faint; to become weak; to become dismayed or discouraged.
5. appall ·adj to weaken; to enfeeble; to reduce; as, an old appalled wight.
6. appall ·adj to depress or discourage with fear; to impress with fear in such a manner that the mind shrinks, or loses its firmness; to overcome with sudden terror or horror; to dismay; as, the sight appalled the stoutest heart.