Doubtfulness; doubleness of meaning; indistinctness or uncertainty of meaning of an expression used in a written instrument. Nlndle v. State Bank, 13 Neb. 245, 13 N. W. 275; Ellmaker v. Ellmaker, 4 watts (Pa.) 89; Kroner v. Halsey, 82 Cal. 209. 22 Pac. 1137; ward v. Epsy. 6 Humph. (Tenn.) 447