Douglas Harper's Etymology Dictionary
1580s, from un- (1) "not" + ceremonious. Related: Unceremoniously.
Wiktionary
a. Not ceremonious
WordNet
adj. without ceremony or formality; "an unceremonious speech" [syn: unceremonial]
without due formalities; "unceremonious dismissal from office"
Usage examples of "unceremonious".
Halder addressed at once to Camilla, such unceremonious praise of her beauty, that, affrighted and offended, she hastily seized the arm of Mrs.
Bomback asked them to dine with him the next day, and begged them to come and take an unceremonious dinner the same day with him at Crasnacaback.
Avakian brought the discussion to an unceremonious halt by dumping us all back to an abstract workspace where we faced each other around a table.
It is all very pleasant, unpretending, unceremonious, cheerful, well ordered, commendable, but not imposing.
Bootle, who disapproved of such unceremonious behaviour, returned a non-committal answer.
It was not devotion to an outdoor life, but the frequentation of foreign cafes which was responsible for that habit, investing with a character of unceremonious impermanency Mr Verloc's steady fidelity to his own fireside.