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obsidious adjective. rare. from Latin obsidium siege, from obsidere: see OBSESS, -IOUS. Besieging; besetting, siege like, besiege, unrelenting, attempt to overpower, an extensive period of misery.
With his relentless obsidious nature, he would not let up until he conquered all before him.

The misery he endured was truly obsidious.
by Obsidious August 02, 2009