misspend

verb

Etymology: From Middle English misspenden, equivalent to mis- + spend.

1. To spend poorly, incorrectly or unwisely.

   “I misspent my youth making friends and meeting people. Wait a minute: that's the secret of my success!”

   “Matters of a much more extraordinary kind are to be the subject of this history, or I should grossly mis-spend my time in writing so voluminous a work […]”