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subnormal

adjective
 
 
/ˌsʌbˈnɔː.məl/ US  /-ˈnɔːr-/

Definition

below an average or expected standard, especially of intelligence: mentally subnormal subnormal temperaturesStupid and sillyOf unsound mind
(Definition of subnormal adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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