Longman Dictionary of Contemporary English homepage

wasteful

 adjective
     
waste‧ful
using more of something than you should, especially money, time, or effort:
a wasteful use of resources
wasteful of
The software is very wasteful of memory.
—wastefully adverb:
Lily had wastefully left the light on.
—wastefulness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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