also: こむつかしい
i-adjective
slightly difficult; somewhat bothersome; troublesome; peevish; querulous
Describes something that is a bit hard to deal with, either because it is complicated or because it is annoying. Often used for tasks, problems, or people who are fussy.
この問題は小難しいけど、解けるよ。
This problem is a bit tricky, but I can solve it.
彼は小難しいこと
He's the kind of person who says troublesome things.