Synonyms of 'misspent'
wastedDictionary, thrown away, squandered
She recalled getting drunk during her misspent youth.
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A lot of it has simply been dissipated.
If you say that it is idle to do something, you mean that it is not worth doing it, because it will not achieve anything.
It would be idle to pretend the system is worthless.
Thesaurus for misspent from the Collins English Thesaurus
not used profitably or wisely