noun-modifying (irregular)
various small things; sundry; assorted
Describes a collection of miscellaneous, often trivial items or details. Used prenominally to modify nouns like もの (things), 用事 (errands), or 話 (talk).
See also: 細細した (こまごました)
こまごました用事で一日が終わった。
The day was spent on various small errands.
引き出しにはこまごましたものが詰まっている。
The drawer is stuffed with sundry small items.
細かい is a general adjective meaning 'fine' or 'detailed', while 細々とした specifically emphasizes a collection of miscellaneous small things.
Reduplication of 細か (こまか, 'fine, small') with the adverbial suffix と and the past/attributive form した, functioning as a prenominal adjective.