subnormal

UK: /ˌsʌbˈnɔː^rm^əl/ US: /sʌbˈnɔrməl/ ,(sub nôr′məl)

WordReference Random House Learner's Dictionary of American English © 2025

sub•nor•mal /sʌbˈnɔrməl/   adj. 

1. below the normal or average;
   less than or inferior to the normal:
   The scores indicate subnormal intelligence.

See -norm-.

WordReference Random House Unabridged Dictionary of American English © 2025

sub•nor•mal  (sub nôr′məl), adj. 

1. below the normal;
   less than or inferior to the normal:
   a subnormal amount of rain.
2. Psychology being less than average in any psychological trait, as intelligence, personality, or emotional adjustment.

n. 

3. Psychology a subnormal person.
4. Mathematics [Geom.] that part of the x-axis of a curve cut off between the ordinate and a normal.

• sub- + normal 1700–10

sub′nor•mal′i•ty, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

subnormal / sʌbˈnɔːməl/ adjective

1. less than the normal
2. having a low intelligence, esp having an IQ of less than 70

noun

1. a person of low intelligence

subnormality / ˌsʌbnɔːˈmælɪtɪ/ noun