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aberrant

adjective
 
 
/əˈber.ənt/ /ˈæb.ə.rənt/ formal

Definition

different from what is typical or usual, especially in an unacceptable way: aberrant behaviour/sexualityStrange, suspicious and unnaturalWrong
(Definition of aberrant adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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