"no more interested" is a grammatically correct and usable phrase in written English.
It can be used to indicate a diminishing or complete lack of interest in something. For example, "After hearing more about the job, I was no more interested in applying."
I'm no more interested in who Belle 'really is' than I am interested in who Jack The Ripper 'really' was.
I'm no more interested in that than I would be in her innermost thoughts on the term "white people".
I can play devil's advocate for every candidate possible but I'm no more interested in that role than in engaging in political debates with my closest friends and family.
Perhaps his most important insight is that an AI might be no more interested in the human life that underlies its existence than humans are interested in bacteria.
Suns Coach Alvin Gentry was no more interested in discussing the subject.
This crowd is no more interested in genuine electoral reform than Britney Spears is.
There is no group more interested in the operation and management of the public schools than the taxpayers who support them and the parents whose children attend them.
VCs have relations like anyone else and there is no relationship more interested than a VC partnership.
Photographers, stylists and others who worked with him say he was a no-nonsense professional, more interested in the paycheck than the parties.
"No-one's more interested in heart health than the owner of the heart". Heart disease and stroke are the biggest killers in the world, accounting for about 14 million deaths a year.
No one was distracted with a text, and no one was more interested in posting a photo of the meal on Instagram than in eating it with friends.
