such; that sort of; that kind of (pre-noun adjective referring to something related to the listener or what was just mentioned)
そんな話、信じられないよ。
I can't believe a story like that.
そんなに高くないから安心して買ってください。
It's not that expensive, so feel free to buy it.
そんな人だとは思わなかった。
I didn't think he was that kind of person.
そんなことを言うなんて失礼だ。
It's rude to say something like that.
an interjection meaning 'no way!' or 'that's impossible!' (colloquial)
そんな！信じられない！
No way! I can't believe it!
そんな、もう終わったの？
What? It's already over?