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appall (v.)

also appal, early 14c., "to fade;" c. 1400, "to grow pale," from Old French apalir "become or make pale," from a- "to" (see ad-) + palir "grow pale," from Latin pallere "to be pale" (from PIE root *pel- (1) "pale"). Transitive meaning "cause dismay or shock," is 1530s. Related: Appalled; appalling.

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Definitions of appall from WordNet

appall (v.)
strike with disgust or revulsion;
Synonyms: shock / offend / scandalize / scandalise / appal / outrage
appall (v.)
fill with apprehension or alarm; cause to be unpleasantly surprised;
Synonyms: dismay / alarm / appal / horrify
From wordnet.princeton.edu