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Priscilla Presley 's lawyer is firing back at the former business partners suing her and alleging she let Lisa Marie Presley die so she could take control of Graceland ... telling us their lawsuit is one of the most shameful, ridiculous, salacious and meritless things he's ever seen.

Priscilla's attorney, Marty Singer , tells TMZ ... the lawsuit against Elvis Presley 's ex-wife is "nothing more than a sad and vicious attempt to falsely tarnish the reputation of an eighty-year-old woman." Getty

Singer says Priscilla's legal foes here are on their fourth different set of lawyers and he says the lawsuit is a "disgusting publicity stunt."

He adds ... "Accusing a grieving mother of contributing to her daughter’s death is not savvy advocacy; it is malicious character ass

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