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History
History
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Meaning:
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causing waste; using more than is needed

not economical

careless destructive extravagant lavish profligate reckless cavalier dissipative immoderate improvident incontinent liberal overdone overgenerous pound-foolish prodigal profuse ruinous spendthrift squandering thriftless uneconomical unthrifty wanton wild
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Cases of word usage

1) wasteful and not caring about future needs (improvident)

2) to make (something) more efficient (by getting rid of slow or wasteful methods etc) (streamline)

WASTEFUL as in Wiktionary
WASTEFUL as in Wikipedia