Entry 3 senses · 2 variants Webster, 1913 Unthrift · Un·thrift · IPA /ˈʌnθɹɪft/ n. a. 01 n. Want of thrift; unthriftiness; prodigality. 1. Want of thrift; unthriftiness; prodigality. 2. An unthrifty person.[Obs.] 02 a. Unthrifty. 1. Unthrifty.[Obs.]