mysteriously

From Middle English misteriusly, equivalent to mysterious +‎ -ly.^[1]

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mysteriously (comparative more mysteriously, superlative most mysteriously)

1. In a mysterious manner.
   • 1831, Thomas Carlyle, “The Everlasting Yea”, in Sartor Resartus: The Life and Opinions of Herr Teufelsdröckh. […], London: Chapman and Hall, […], →OCLC, 2nd book, page 130:

     Fore-shadows, call them rather fore-splendours, of that Truth, and Beginning of Truths, fell mysteriously over my soul.

   • 1881, P. Chr. Asbjörnsen [i.e., Peter Christen Asbjørnsen], translated by H. L. Brækstad, Round the Yule Log. Norwegian Folk and Fairy Tales, London: Sampson Low, Marston, Searle, & Rivington, →OCLC, page 76:

     'Are there any hares about here?' I asked. 'Well, there are some left to be sure,' answered the peasant; 'on the Sukkestad-moor there is an old jack-hare, which many a hound and sportsman have been after, but he is not so easily killed, it appears.' And the worthy peasant shook his head somewhat mysteriously.

   • 1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], →OCLC, part I, page 219:

     I put my finger to the side of my nose and nodded mysteriously.

   • 1946, George Johnston, Skyscrapers in the Mist, page 121:

     At that moment a long, scraggy individual in a checked suit poked his head into the bar, looked around portentously, whistled mysteriously to my informant, and jerked his thumb and head in the direction of the door.