misspend

To spend improperly or extravagantly; squander.

To spend amiss; make a bad or useless expenditure of; waste: as, to misspend time or money; to misspend life.

To spend amiss or for wrong purposes; to squander; to waste.

To spend poorly, incorrectly or unwisely.

spend time badly or unwisely

spend (money or other resources) unwisely