Difficult or awkward to handle, use, or deal with; requiring extra care or effort.
この機械は扱いにくいので、取扱説明書をよく読んでください。
This machine is hard to handle, so please read the instruction manual carefully.
彼は性格がちょっと扱いにくい人だが、日を追うごとに理解できるようになった。
He's a somewhat difficult person to deal with, but I came to understand him better over time.
このソフトは操作が複雑で初心者には扱いにくい。
This software is complicated to operate and hard for beginners to handle.