Describes someone negatively for their excessive consumption or usage of resources. Stop being a waster and turn off the lights when you leave the room.
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Informal Usage
Used in casual conversations and often considered rude or insulting. I wouldn't hire him; he's known to be quite the waster.
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Context Specific
Can refer to wasting various things like money, time, or potential. She's talented but doesn't apply herself – a real waster of talent.