Definition of wasteful adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈweɪstfl//
; NAmE NAmE//ˈweɪstfl//
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using more of something than is necessary; not saving or keeping something that could be used The whole process is wasteful and inefficient. a wasteful use of resources The water shortage is due to wasteful consumption during a period of drought. wasteful of something an engine that is wasteful of fuel This system is wasteful of time and energy.
See the Oxford Advanced American Dictionary entry: wasteful