crafty; tricky; sly; wily; treacherous; underhand
sinister (look)
陰険な手口で人を騙す詐欺が増えている。
Fraud that deceives people through crafty methods is increasing.
彼の陰険な笑みに不信感を抱いた。
I felt distrust at his sly smile.
陰険な策略を見抜いて対策を講じた。
The crafty scheme was seen through and countermeasures were taken.