勝手に水質検査を行ったあげく浄水器を売りつけるなど、悪質な訪問販売が多発しています。

tbd

There are frequent instances of malicious door-to-door selling, such as pushing water purifiers on people after carrying out water quality tests without permission.

大学出たての新人は資料を作ったり、コピーをとったりと裏方仕事に徹するのだろうと、勝手に想像していたのですが見事に裏切られました。

tbd

I had imagined that the newbies fresh from university would probably be stuck with all the backstage work - collecting reference material, getting copies and such but I couldn't have been proved more wrong.

部屋におられない間に勝手に辞書をお借りしました。

tbd

I took the liberty of using the dictionary while you were out of the room.

彼はなんでも自分のわがまま勝手にしたがる。

tbd

He wants to have everything his own way.

適当に入って勝手にやって。

tbd

Come on in and make yourself at home.

地域参加を呼びかけてもしょせんは美辞麗句、どのみち市役所はやりたいことを勝手にやるに決まっている。

tbd

The claim of community involvement is just window dressing; City Hall will do what it wants to anyhow.

勝手に早退するなんて、あまりに無責任だよ。

tbd

Don't try to duck out early. Where's your sense of responsibility?

勝手に何でも使って。

tbd

Make yourself at home.

勝手にすれば？

tbd

Do as you like.

勝手にそんなふうに想像するなよ。

tbd

Don't let your imagination run wild.