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English definition of “conspiratorial”

conspiratorial

adjective uk   /kənˌspɪr.əˈtɔː.ri.əl/ us    /-ˈtɔːr.i-/
relating to a secret plan to do something bad, illegal, or against someone's wishesSly and devious showing that you share a secret: They exchanged conspiratorial glances.Secrecy and privacy
conspiratorially
adverb uk   /-i/ us  
She heard them whispering conspiratorially in the bedroom.Plotting and trappingPlanning, expecting and arrangingCheating and tricking
(Definition of conspiratorial from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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