unˈbeatable,a. (un-1 7.) 1897Outing (U.S.) XXIX. 483/2 The dogs..were, however, very pretty and almost unbeatable on the show-bench. Add: Hence unˈbeatablyadv. 1928Funk's Stand.Dict., Unbeatably.1979Daily Tel. 2 Feb. 17/1 Lanvin's flaring circular skirt..flatters unbeatably.