Antonyms of ABOVEBOARD

Examples of usage:

  1. I am open and aboveboard myself, and if my secretary did not choose to be open and aboveboard, and behave like an ordinary human being, she should depart, and I would tell Walkirk to get me an ordinary human being, capable of writing from dictation, or depart himself. "The House of Martha" by Frank R. Stockton
  2. There ain't supposed to be anything doing in these blessed islands that ain't aboveboard, but 'tisn't as though the place was run by Americans. "The Best Short Stories of 1921 and the Yearbook of the American Short Story" by Various
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