Definition of unceremonious adjective from the Oxford Advanced American Dictionary

 

unceremonious

 adjective
adjective
NAmE//ˌʌnsɛrəˈmoʊniəs//
 
(formal)
 
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done roughly and rudely He was bundled out of the room with unceremonious haste. compare ceremonious
See the Oxford Advanced Learner's Dictionary entry: unceremonious