狡い手口で客を騙す商人がいた。
There was a merchant who cheated his customers with crafty tricks.
あの男は狡いから、うまい話には気をつけたほうがいい。
That man is sly, so you'd better be wary of any offer that sounds too good.
審判の見えない所で反則をするとは狡い選手だ。
Committing fouls where the referee can't see makes him an underhanded player.