Multifarious means of many different sorts all at once. Not just many — many kinds.
That distinction is the whole point of the word, since numerous means a lot and multifarious means varied. It attaches to duties, activities and interests, and somebody's multifarious commitments is a formal way of saying they are involved in far too many things. The word is formal and slightly showy. Diverse and varied do the same job with less effort from the reader.
1adjectivemultifariousOf many different kinds.
“His multifarious duties left no time for anything else.”
Also accepted in games: varied, diverse
Proto-Indo-European
*dʰeh₁-
Latin
multifārius
English, today
multifarious
From Latin multifārius.
Etymology from Wiktionary, CC BY-SA