Simple past tense and past participle of misspend.(verb)
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Use "misspent" in a sentence
"It is very fitting that Mr. Frederic's last book should be in praise of action, the thing that makes the world go round; of force, however misspent, which is the sum of life as distinguished from the inertia of death."
"And his talk, we are told, during the fortnight that preceded his death, was not regret for a life we should, in seriousness, call misspent, but because partridges and pheasants no longer suited his condition, and he was obliged to be reduced to boiled meats."
"In the early days of his England captaincy, John Terry often found himself wincing when asked to recall his misspent youth."