Definition of unceremoniously adverb from the Oxford Advanced Learner's Dictionary

 

unceremoniously

 adverb
adverb
BrE BrE//ˌʌnˌserəˈməʊniəsli//
 
; NAmE NAmE//ˌʌnˌserəˈmoʊniəsli//
 
(formal)
 
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in a rough or rude way, without caring about a person’s feelings They dumped his belongings unceremoniously on the floor.
See the Oxford Advanced American Dictionary entry: unceremoniously