He adjective subhuman refers to what results lower to what is considered as human being . The subhuman, therefore, belongs to a lowest category than that which is indicated as appropriate for people.
For example: "Due to the economic need, many individuals are forced to accept subhuman jobs that put their health at risk", “Millions of children live in subhuman conditions around the world and no political leader seems to care too much”, “In the prisons of this country the prisoners suffer an infra-human treatment by the guards”.
Take the case of patients of a neuropsychiatric hospital They are locked in a gloomy environment. These subjects are poorly fed, suffer from various diseases without treatment and are mistreated by doctors and nurses. For all these questions, these individuals are in a infrahuman state , being forced to live in an unworthy way.
It is common for the subhuman to be associated with poor living conditions. In a irregular settlement like a misery village, a favela, a cantegril or a shack, where the inhabitants do not have sewers, drinking water, electricity or natural gas, the streets are not paved and there is no security , people subsist on a infrahuman environment .
In the field of fiction sometimes appear infrahuman beings : creatures with certain characteristics that resemble humans, but with others that place them on a lower level or step. H. G. Wells , to cite a case, present the Morlocks , a infrahuman race , in his novel "The time Machine" .