pandemoniac noun 2adjective 1forms 3 noun2 •One who delights in pandemonium and often causes it.[…]and in his two hands were two wind instruments, which he used alternately for the production of sounds delicious to boys and pandemoniacs. — 1872 •Something that is characterized by pandemonium.My spirit then sending signals through these partial diameters, through dangers magically implied by powers which roam the pandemoniacs of the Oort dimension. — 2011 adjective1 •Relating to, resembling, or characteristic of, a pandemonium.I was taken out of my bed, overpowered with the unnatural heavy sleep, as usual, when the necromancer chooses to give me a pandemoniac lodging, to please his own demoniac fancy. — 1821 formspandemoniacs · more pandemoniac · most pandemoniac