assumingly,adv.|əˈsjuːmɪŋlɪ| [f. assuming ppl. a. + -ly2.] In an assuming manner, presumptuously. 1839J. P. Smith Scripture & Geol. 215 What I may, not assumingly, call the whole body of geologists.1927Scots Observer 12 Mar. 3/5, I ken him fine commented the other assumingly.