I've never heard that before
この単語は初めて聞いたよ。
I've never heard this word before.
そんな話初めて聞いたよ
That's the first time I've heard that.
— マルホランド・ドライブ (2001)
お前のあんな話し方、初めて聞いたよ。
I've never heard you talk like that before.