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English definition of “complex”

complex

noun [C] (BAD FEELING)    /ˈkɒm.pleks/ US  /ˈkɑːm-/
C2 a particular anxiety or unconscious fear that a person has, especially as a result of an unpleasant experience that they have had in the past or because they have a low opinion of their own worth: an inferiority complex I think he's got a complex about being bald. Don't go on about her weight - you'll give her a complex!Mental and psychiatric disorders
(Definition of complex noun (BAD FEELING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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