subnormal

adj

1. Less than normal.

   “Near-synonym: below average”

   “His intelligence was considered subnormal, but as a musician he was a genius.”

2. denormal

   “Subnormal numbers cannot be normalized because this would result in an exponent that does not fit into the exponent field.”

3. (derogatory, offensive)idiot, stupid.

noun

1. A person whose abilities are less than normal.

   “the IQ scores of mental subnormals”

2. That part of the axis of a curved line which is intercepted between the ordinate and the normal.
3. Synonym of denormal.