unthrift /ˈʌnθɹɪft/noun 2adjective 1forms 3 noun2 •A lack of thriftiness; prodigality. •(no longer used) Someone who is not thrifty; a spendthrift, someone who is not careful with their money.My scoles are not for unthriftes untaught, For frantick faitours half mad and half straught; But my learning is of another degree — 1515 adjective1 •Unthrifty.VVots thou vvho's returnd, / The unthrift Bonvile, ragged as a scarre-crovv / The VVarres have gnavv'd his garments to the skinne: […] — 1637 formsunthrifts · more unthrift · most unthrift