Idle talk; chit-chat or gossip — talk that is trivial or wastes time.
毎朝、同僚と無駄話をしてから仕事を始める。
Every morning I start work after some chit‑chat with my coworkers.
会議中に無駄話をすると注意された。
I was warned for making idle talk during the meeting.
学生時代は無駄話ばかりして勉強しなかった。
In my student days I did nothing but chat and didn't study.