"more or less exact" is correct and usable in written English.
You can use it to indicate that something is partially correct or to suggest approximate accuracy. For example, "He estimated that the job would take up to 10 hours, more or less exact."
MR. COUNSELLOR SMIRNOV: Please give a more or less exact figure.
He possessed an enormous facility in rhyme, but he also enjoyed its simplest games, such as finding words that enclosed within themselves a more or less exact rhyme word: "dread" and "read," "heart" and "art," "stairs" and "stars," "shame" and "same".
We have no particular reason to believe the sentence proposed by these four persons is any more or less exact than other attempts at translation.
In technological terms, higher productivity economies are benefiting from an apparent effect: they produce GDP in (more or less) exact proportion to their consumption of fossil fuels, but more than proportionally to their consumption of biomass.
Even if the reaction rates were to cooperate, realistic networks always have uncertainties and minor details in network connectivity that would cause some divergence: we have discussed examples in conjunction with Figure 4 of more or less exact correspondences with biological networks.
Jeremy Deller, his more-or-less exact contemporary, conceptualises on a grand scale.
Now it's easier than ever to look like the celebrity of the moment, with retailers churning out more-or-less exact replicas of their outfits.
If set up correctly they robustly provide more or less accurate approximations of the exact solution.
That's more or less accurate.
It was more or less an exact replica of the Mongo one and included the same endpoints and functionality.
From more or less the exact second that Portman stops having sex with Mila Kunis, the film turns into a sort of big budget Sam Raimi telenova.
