If there is pandemonium in a place, the people there are behaving in a very noisy and uncontrolled way. There was pandemonium in court as the judge gave his summing up. a situation in which there is a lot of noise because people are angry, confused or frightened = chaos (Pandaemonium city of evil spirits in the poem Paradise Lost (1667) by John Milton, from pan- ( PAN-) + daimon )
() Coined by John Milton in "Paradise Lost," Pandæmonium, from Ancient Greek πᾶν (pan, “all”) (equivalent to English pan-) + Late Latin daemonium (“evil spirit, demon”), from Ancient Greek δαίμων (daimōn, “demon”).