1Unpleasant, disagreeable, or nasty — describes behavior or an attitude that makes others feel uncomfortable. Usually written in kana.
彼のいやらしい態度にみんなが不快感を覚えた。
Everyone felt uncomfortable because of his unpleasant attitude.
いやらしい言い方はやめてほしい。
I wish you'd stop talking in that nasty way.
あの上司の、部下を見下すいやらしいところが嫌いだ。
I dislike that boss's unpleasant habit of looking down on subordinates.
2Lewd, lascivious, or obscene — often used of a person's gaze, remarks, or jokes with a sexual undertone. Usually written in kana.
彼はいやらしい冗談を言って、周りを不快にさせた。
He made a lewd joke and made the people around him uncomfortable.
いやらしい目つきで見られて、気持ちが悪かった。
Being looked at with such a lewd expression made me feel sick.
その雑誌はいやらしい写真ばかり載せていた。
That magazine was full of obscene photos.