Definition from Wiktionary, the free dictionary
From Middle English *wurthles, from Old English weorþlēas (“worthless”), equivalent to worth + -less. Cognate with Dutch waardeloos (“worthless”), German wertlos (“worthless”), Swedish värdelös (“worthless”).
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- Not having worth and use, without value, inconsequential.
- Lies are as important as truth, for without lies, the truth is worthless.
- The committee's decision is worthless. It is not going to be acted upon.
- Don't be a worthless slouch! Go get yourself a job.
Derived terms 
not having worth and use, without value, inconsequential