famously
If something’s famous, you don’t need to tell people; if you need to tell people something’s famous, it isn’t.
“Famously” is typically used to mean one of two things:
I know everyone knows this, but I can’t think of an original way to start so I am going to say it anyway.
Harold Macmillan, asked what the biggest challenge is for any leader, famously replied: “Events, my dear boy, events.”
You don’t know this? I do. That shows I am clever and know lots of stuff you don’t.
Reich famously declined to continue in academia, preferring to support himself via a series of blue-collar jobs.