aghast

Etymology

From Middle English agast, agasted, past participle of agasten (“to terrify”), from Old English a- (compare with Gothic 𐌿𐍃- (us-), German er-, originally meaning "out") + gæstan (“to terrify, torment”): compare Gothic 𐌿𐍃𐌲𐌰𐌹𐍃𐌾𐌰𐌽 (usgaisjan, “to terrify”, literally “to fix, to root to the spot with terror”); akin to Latin haerere (“to stick fast, cling”). See gaze, hesitate.

adj

1. Terrified; struck with amazement; showing signs of terror or horror.
   I was aghast when the incident unfolded in front of me.
   And while the revellers stood aghast at the fury of the man, one more wicked or, it may be, more drunken than the rest, cried out that they should put the hounds upon her. 1902, Arthur Conan Doyle., The Hound of the Baskervilles
   1985, Les Misérables, the song "Red and Black" I am agog! I am aghast! Is Marius in love at last?
   We sat at a long table with a huge salmon on a platter in the center, prepared Szechuan style. Dad sat at one end of the table, and regaled all present with his stories. In the middle of one convoluted yarn, he rose and went around to the salmon in the center of the table. Using his fingers, he dug an eyeball out of the fish, popped it in his mouth and swallowed it whole as we looked on, aghast. “A real delicacy,” he said, with a boyish smirk. 2003, Brian Herbert, “Xanadu”, in Dreamer of Dune, New York: Tom Doherty Associates, →LCCN, →OCLC, page 259
   Hart, for one, will not remember the night for Lambert's heroics. Morrison, not closed down quickly enough, struck his shot well but England's No1 will be aghast at the way it struck his gloves then skidded off his knees and into the net. 14 August 2013, Daniel Taylor, The Guardian