勝手に

かってに

[katteni]

Meanings

1.Adverb

arbitrarily; of its own accord; without asking; voluntarily; willfully; as one pleases; selfishly; by itself; automatically

彼は勝手に私の部屋に入ってきたので怒った。

I got angry because he entered my room without permission.

勝手に人の物を使うのはマナー違反だ。

Using other people's things without permission is bad manners.

子供が勝手に家を出て心配になった。

I got worried because the child left the house on their own.