flagitious

“Flagitious” is neither, but is terminally obscure.

Sylvia had disliked Avery very much when she met him in London nearly two years ago; but the worst enemy, the most flagitious bore, is transformed when encountered alone in a distant country, and now Sylvia felt well disposed toward him and eager to share with any one who could appreciate her pleasure the marvel of being in Tetuan.

It falls to my lot, at this stage of my history, to be constrained to record an event the most astounding, the most awful, the most unexpected, the most treacherous, the most ungrateful, the most flagitious—yea, the most supereminently flagitious,—that the history of mankind affords.

The next evening the convention met, and a Secret Committee was raised with instructions to write a lettre de cachet to the President, explaining the flagitious conduct of Sergeant Trap, and demanding his immediate dismissal from the army.

Indignation is a generous outburst of ~ in view of things which are indigna, or unworthy to be done, involving what is mean, cruel, flagitious, etc., in character or conduct.