not on purpose
I didn’t mean to say it that way.
Не нарочно, сами изволите знать-с!
It wasn’t on purpose—you know that yourself, sir!
I didn't break it on purpose.
Я каким-то образом задела Сондерса за живое, хотя и не нарочно.
I somehow hit a nerve with Saunders, though I didn’t mean to.
I know you didn't mean to.