The phrase "about the multifarious" is correct and usable in written English.
It can be used when discussing a variety of topics, elements, or aspects that are diverse or varied in nature.
Example: "The lecture focused on the multifarious influences of culture on language development."
Alternatives: "regarding the diverse" or "concerning the varied".
Learn about the multifarious activities of the Vikings and their civilization --- war, peace, trade, and discovery!
Also up there is an extraordinary amount of knowledge about the multifarious art that the museum has shown over the last 30 years, and that it plans to show in the next two or three.
We were all eager to know more about Bali, and about the multifarious world that Cynthia and her husband, John, have created here, all in the cause of promoting sustainability and an appreciation for the world's natural balances.
I no longer see rows of concrete housing blocks as the only urban landscape in the east, and those I do see I now know much more about, including the multifarious lives going on inside them.
One of the most important discoveries of the period of about 1430 especially in the work of van Eyck was the multifarious effects a painter can achieve by observing the action of light.
This has been an exciting, and perhaps disquieting, week for those employed in the multifarious business of having opinions about whether Andy Murray will finally, perhaps, win a grand slam.
37.A MoMA retrospective for the multifarious Robert Gober.
This delicious compendium captures the essence of the multifarious Catalog.
The multifarious kinetic constants were determined under reaction conditions.
Rethinking the marine carbon cycle: factoring in the multifarious lifestyles of microbes.
Worden, A. Z. et al. Rethinking the marine carbon cycle: factoring in the multifarious lifestyles of microorganisms.
