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subterhuman
subterhuman adj.
Brit. 
/ˌsʌbtəˈhjuːmən/
, /ˌsʌbtəˈhjuːmən/U.S. /ˌsəbtərˈ(h)jumən/
below what is human; less than human./ˌsəbtərˈ(h)jumən/ΘΚΠ
the world > people > [adjective] > below what is human
subterhuman1833
infrahuman1847
1833 T. Carlyle in Fraser's Mag. Aug. 135/1 He were no man, but some other kind of creature, superhuman or subterhuman.
1936 S. Sitwell Dance of Quick & Dead vi. 395 The rain strikes hard. It is expressed in symbols that are subterhuman, infinitely small.
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