Misspend \Mis*spend"\, v. t. [imp. & p. p. {Misspent}; p. pr. & vb. n. {Misspending}.] To spend amiss or for wrong purposes; to aquander; to waste; as, to misspend time or money. --J. Philips.
misspend v 1: spend time badly or unwisely; "He misspent his youth" 2: spend (money or other resources) unwisely [also: {misspent}]