i Register
In some senses, mu'tazili is marked as historical. Watch for register when choosing this word.
adj
Of or relating to the Mu'tazila.
They rejected the Mu'tazili notion of the createdness of the Quran, affirmed the contrary – its uncreatedness – and made this a fundamental tenet of faith, as a way of asserting the superiority of the Quran to all human reasoning and knowledge.
noun
A follower of Mu'tazili Islam.