na-adjective, noun which may take the genitive case particle 'no', noun
all sorts of; various; miscellaneous
Describes a diverse, mixed collection of things or people. Often used in formal or written contexts. As a yojijukugo, it carries a slightly literary or emphatic tone.
会場には種々雑多な人々が集まった。
All sorts of people gathered at the venue.
Miscellaneous documents are piled up on his desk.
A yojijukugo composed of 種々 (various kinds) and 雑多 (miscellaneous, motley). The exact historical derivation is uncertain, but it follows a common pattern of combining two two-kanji compounds with similar meanings for emphasis.