adv. [f. prec. + -LY2.] After the manner of an abyss; with unfathomable depths; unfathomably.

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1869.  Will-o’-the-Wisp, II. 14 Aug., 254. They should have strangled you rather than have permitted you to utter that abysmally stupid speech which you made last Tuesday.

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1879.  Geo. Eliot, Theo. Such, xviii. 314. The prejudiced, the puerile, the spiteful, and the abysmally ignorant.

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1891.  Zangwill, Bachelors’ Club, x. 255. After abysmally deep reflection I said there was only one way for me to decide between them.

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1923.  P. Rosenfeld, in The Dial, LXXIV. 223. The first two movements are abysmally weak, and represent a past of which the composer can scarcely be vain.

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