APPALL', verb transitive [Latin palleo, to become pale. See Pale.] 1. To depress or discourage with fear; to impress with fear, in such a manner that the mind shrinks, or loses its firmness; as, the sight appalled the stoutest heart. 2. To reduce, allay or destroy; as, to appall thirst. [Unusual.] APPALL', verb intransitive To grow faint; to be dismayed.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI