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.
mix of meaning and mischievous. something or someone who is obicious is deeply disturbed, but also fun. The word is packed with evil and shouldn't be used lightly.