unˈguessable,a. (un-1 7 b.) 1832Miss Mitford Our VillageSer. v. 278 An old bonnet,..so twisted..that its pristine shape was unguessable.1865Dublin Univ.Mag. I. 266 There are passages..the meaning whereof..is to me unknowable, unguessable. [Common in recent use.]