unenˈthusiastic,a. (un-1 7.) Also, in recent use, unenthusiasticallyadv. 1805A. Knox Rem. (1834) I. 38 There is nothing supposed here, which the..unenthusiastic Addison does not..admirably describe.1865Trollope Belton Est. xxviii, He had been calm, unenthusiastic, and reasonable.