deˈsignfulness [f.prec. + -ness.] Designful quality: a. craftiness, scheming; b. fullness of design, intentional or prearranged character. a1677Barrow Serm.Wks. 1716 II. 83 Drawn over with..features of base designfulness.1890J. H. Stirling Gifford Lect. v. 94 The designfulness is but contingent.