infrahuman adjective 3noun 1forms 3 adjective3 •Below the level of the human. •In a spiritual or metaphysical way.By his hubristic defiance of time, Dorian wanders into an infrahuman realm where he is at the mercy of pitiless daemonic agents. — 1990 •(no longer used) In a taxonomic way that views humans as innately superior to other primates and other mammals. noun1 •A creature that is not (yet) at the level of understanding of a human being, such as a presymbolic child or an animal. formsinfrahumans · more infrahuman · most infrahuman