[adjective] [formal] - done in a rude, sudden or informal wayan unceremonious refusalan unceremonious dismissal noteMeeting Lord Portish and his wife, I was pleasantly surprised by their unceremonious, relaxed attitude to life.
UNCEREMONIOUS
Meaning of UNCEREMONIOUS in English
Cambridge English vocab. Кембриджский английский словарь. 2012