mysterious

Part of speech: adverb

Mysteriously.

Part of speech: noun

Mysteriousness.

Part of speech: adjective

Involved in or implying mystery; incomprehensible.

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Usage examples "mysterious":

  1. Dewey appeared to have over them some mysterious influence, above which they had not power to rise. - "The Allen House or Twenty Years Ago and Now", T. S. Arthur.
  2. None of the rest stayed to face this awful and mysterious foe. - "Jack Haydon's Quest", John Finnemore.
  3. And I just wonder if those two mysterious- looking gentlemen aren't the reason for her trip! - "Behind the Green Door", Mildred A. Wirt.