Complicated; complex; intricate; causing confusion or trouble — used for things that are hard to understand or troublesome.
この説明はややこしくてよく分からない。
This explanation is complicated and I don't understand it well.
名前が似ていてややこしいから、フルネームで呼んでください。
The names are similar and confusing, so please call us by our full names.
手続きがややこしいので窓口で確認した。
The procedure was complicated, so I checked at the counter.