without worth; of no use, importance, or value; good-for-nothing: a worthless person; a worthless contract.

1580–90; worth1 + -less

worthlessly, adverb
worthlessness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
worthless (ˈwɜːθlɪs)
1.  without practical value or usefulness
2.  without merit; good-for-nothing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The comments about how worthless this kind of research is trouble me on more
  than one level.
Whoever is in charge of making this complete national geographic software work
  is a worthless piece of garbage.
What makes all autobiographies worthless is, after all, their mendacity.
He simply stamps his contact information on essentially worthless currency from
  other countries.
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