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Less than normal; below the average.
Offensive One who is regarded as subnormal in some respect, such as in intelligence or coordination. No longer in clinical use.

sub′nor·mal′i·ty (-nôr-măl′ĭ-tē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.subnormality - the state of being less than normal (especially with respect to intelligence)
abnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies
2.subnormality - lack of normal development of intellectual capacities
stupidity - a poor ability to understand or to profit from experience
mental defectiveness, abnormality - retardation sufficient to fall outside the normal range of intelligence
mental deficiency, moronity - mild mental retardation
amentia, idiocy - extreme mental retardation
imbecility - retardation more severe than a moron but not as severe as an idiot
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The Bill, however, takes care not to include mental retardation, which is a condition of arrested or incomplete development of a person's mind, specially characterised by subnormality of intelligence.
Costello, "A new syndrome: mental subnormality and nasal papillomata," Australian Paediatric Journal, vol.
Marvel, Annotation, Mental Subnormality of Accused as Affecting Voluntariness or Admissibility of Confession, 8 A.L.R.
Mental subnormality is one of those disorders where the understanding or the therapy is a matter of disillusionment.
The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-V) [1] defines ID as "a disorder with onset during the developmental period that includes both intellectual and adaptive functioning deficits in conceptual, social, and practical domains." The term ID is introduced in DSM-V in accordance to Rosa's law, [2] which replaces all other synonymous terms such as "mental retardation (MR)," "mental subnormality," and "feeblemindedness," which were previously used to describe it.
Complications notwithstanding, Cowen's formula has provided an essential tool in a number of investigations involving linear-fractionally induced composition operators, for example: subnormality and co-subnormality [6], essential normality [2], and self-commutator properties [3].