UNCEREMONIOUS Meaning of UNCEREMONIOUS in English [un.cer.e.mo.ni.ous] adj (1598) 1: not ceremonious: informal 2: abrupt, rude "an ~ dismissal" -- un.cer.e.mo.ni.ous.ly adv -- un.cer.e.mo.ni.ous.ness n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012