プログレッシブ和英中辞典(第4版)の解説
ややこしい
〔複雑な〕complex, complicated, intricate；〔解決できそうもない〕knotty；〔やっかいな〕troublesome
この小説のプロットはややこしい
This novel has 「an intricate [a complex] plot.
これがその作家独特のややこしい文体だ
This is the characteristic convoluted style of the writer.
ややこしい問題だ
It's a knotty [troublesome] problem.／The problem is difficult [hard] to solve.
二人の関係はややこしい
The relations between the two men are involved [complicated].