YOU SAID:

Not funny didn't laugh.

INTO JAPANESE

おかしくないと笑わなかった。

BACK INTO ENGLISH

I didn't laugh if it wasn't funny.

INTO JAPANESE

おかしくなければ笑わなかった。

BACK INTO ENGLISH

If it wasn't funny, I wouldn't have laughed.

INTO JAPANESE

おかしくなかったら、私は笑わなかったでしょう。

BACK INTO ENGLISH

If it wasn't funny, I wouldn't laugh.

INTO JAPANESE

おかしくなかったら、私は笑わないでしょう。

BACK INTO ENGLISH

If it weren't funny, I wouldn't laugh.

INTO JAPANESE

おかしくなかったら、私は笑わないでしょう。

BACK INTO ENGLISH

If it weren't funny, I wouldn't laugh.