from The Century Dictionary and Cyclopedia
- Resembling pandemonium, particularly with respect to its noise.
Sorry, no etymologies found.
In addition, I'm having second thoughts about deserting America at this particularly pandemoniacal moment.
A sort of solemn hush, in company with the night, caused comparative stillness to brood over the scene, in contrast to the pandemoniacal noise that had previously reigned so fiendishly.
We had returned nearly to the hotel in this undignified manner, the throng of persecutors gathering strength as we entered the streets, till we were completely surrounded -- those in front walking backwards, and stopping every now and then suddenly, that we might be jostled against by those who were thronging behind, all bellowing the pandemoniacal chorus, without words and still less tune.
It's what might weel be described as pandemoniacal. "
"The noise that instantly ensued in the town was something pandemoniacal.