assuming /əˈsjuːmɪŋ/adjective 1noun 1forms 3 adjective1 •haughty; arrogant noun1 •An assumption.December 16, 1656, Thomas Burton, diary entry No positive inference can he drawn from Nayler's confession, as to his assuming the attributes of Christ, but rather a positive denial of these assumings. formsassumings · more assuming · most assuming