Definition of decorous adjective from the Oxford Advanced Learner's Dictionary

 

decorous

 adjective
adjective
BrE BrE//ˈdekərəs//
 
; NAmE NAmE//ˈdekərəs//
 
(formal)
 
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polite and appropriate in a particular social situation; not shocking synonym proper a decorous kiss Word Origin mid 17th cent. (in the sense ‘appropriate, seemly’): from Latin decorus ‘seemly’ + -ous.
See the Oxford Advanced American Dictionary entry: decorous