waster

/ˈweɪstər/
noun
  1. A person or thing that uses something carelessly or inefficiently, resulting in loss or waste.
    • Don't be a waster of time; focus on your homework.
    • He's a real waster of food, always throwing away leftovers.
    • The old printer was a paper waster, jamming every few pages.
  2. A person who does not achieve much in life; a lazy or irresponsible person.
    • She called him a waster because he never held a job for more than a month.
    • The town was full of young wasters who spent their days doing nothing.
    • After dropping out of school, he was labeled a waster by his family.