My intention was not such.
そういうつもりじゃなかったんだ。
I was compelled to do it against my will.
I didn't mean to put that on there.
From the first I had no intention of going there.
I reckoned without that.
I never thought of that.
I didn't mean to eavesdrop on your conversation.
I never would have thought...
I didn't bargain for that.
That's the last thing I expected.