介(かい)すto use as an intermediary, to mediate, to assist, to worry, to mind, to care

上司(じょうし)を介(かい)して社長(しゃちょう)に意見(いけん)を伝(つた)える。

Convey my opinion to the president using the boss as an intermediary. {to use as an intermediary, to mediate, to assist, to worry, to mind, to care}

彼(かれ)の愚痴(ぐち)は少(すこ)しも意(い)に介(かい)する必要(ひつよう)がありません。

There is no need to mind or care about his complaints at all. {to use as an intermediary, to mediate, to assist, to worry, to mind, to care}

代理(だいり)店(てん)を介(かい)して売(う)ると、手数料(てすうりょう)がかかってしまいます。

When selling through an agency as an intermediary, a commission fee will be incurred. {to use as an intermediary, to mediate, to assist, to worry, to mind, to care}

人(ひと)を介(かい)して彼(かれ)に頼(たの)み事(ごと)をしようとしたら、直接(ちょくせつ)頼(たの)みなさいと言(い)われた。

When I tried to ask him a favor through someone else, I was told to ask him directly. {to use as an intermediary, to mediate, to assist, to worry, to mind, to care}

誰(だれ)が見(み)ていてもまるで意(い)に介(かい)さないとばかりに彼(かれ)は人前(ひとまえ)でだらけ始(はじ)めました。

He began to slack off in public as if he didn't care who was watching. {to use as an intermediary, to mediate, to assist, to worry, to mind, to care}