`'unbounded` isn't a bad idea. With my team when someone new to Rust hits the static type constraint I usually tell them an overly simplified "is not a reference" followed up with "The data does not have any constraints (or bounds) on its lifetime that this code needs to worry about."

I don't know if `unbounded` would immediately be understood by someone new to Rust, but it captures that `T: 'static` is a negating assertion. I.e. it largely says what it can't be.