Etymology
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unceremonious (adj.)

1580s, from un- (1) "not" + ceremonious. Related: Unceremoniously.

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Definitions of unceremonious

unceremonious (adj.)
without ceremony or formality;
an unceremonious speech
Synonyms: unceremonial
unceremonious (adj.)
without due formalities;
unceremonious dismissal from office
From wordnet.princeton.edu