陰いん険けん

na-adjective

crafty; sly; underhand

Describes a person or behavior that is cunning and deceitful in a malicious way, often hiding true intentions behind a pleasant facade.

• 彼かれは陰いん険けんな手て口ぐちでライバルを蹴け落おとした。

  He used underhand tactics to bring down his rival.

• あの人ひとは笑え顔がおの裏うらで陰いん険けんなことを考かんがえる。

  That person thinks sly things behind a smile.

na-adjective

sinister (look)

Specifically refers to a facial expression or appearance that seems sly, malicious, or untrustworthy. Often used with 顔, 表情, or 目つき.

• 彼かれの陰いん険けんな目めつきが気きになった。

  His sinister look bothered me.