Synonyms of 'discredited'
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Something that is obsolete is no longer needed because something better has been invented.
The company says the plant is obsolete and does not merit further investment.
If you describe a belief or custom as outworn, you mean that it is old-fashioned and no longer has any meaning or usefulness.
stubbornly clinging to outworn traditions
Thesaurus for discredited from the Collins English Thesaurus
having lost one's reputation