1. a person who wastes time, money, or resources; someone who is lazy or unproductive
Usage: informal
2. something that uses resources inefficiently or causes waste

Examples

• His parents called him a waster because he dropped out of college.
• Don’t be such a waster – finish your homework before watching TV.
• The old heating system was a real energy waster.
• She thought her brother was a complete waster who never helped around the house.
• That leaky faucet is a water waster that needs to be fixed.
• The teacher warned students not to become time wasters during study hall.