зачем я это сделал

why did I do this

→ зачем
phrase Rare #36,057
why did I do this Used to ask or wonder about the purpose or reason for something the speaker did. The form сделала is used by a female speaker; сделал is used by a male speaker.
RU: Я до сих пор не понимаю, зачем я это сделал.
EN: I still don't understand why I did this.