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decorous

adjective
 
 
/ˈdek.ə.rəs/ US  /-ɚ.əs/ formal

Definition

behaving politely and in a controlled way: His manner, as ever, was decorous.Self-control and moderationBehaving well decorously
 
 
/-li/ adverb
Self-control and moderationBehaving well
(Definition of decorous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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