subnormal

sub·nor·mal

adj \ˌsəb-ˈnȯr-məl\

Definition of SUBNORMAL

1

: lower or smaller than normal <a subnormal temperature>

2

: having less of something and especially of intelligence than is normal

—sub·nor·mal·i·ty \ˌsəb-nȯr-ˈmal-ət-ē\ noun, plural sub·nor·mal·i·ties