It's a very good question.
There's not a precise definition as of today. I think if you take a consumer awareness view of greenwashing, it's essentially selling a product based on something incorrect in what they are selling.
There have been a number of cases brought against companies, brought against investors, some by financial regulators, some by advertising regulators, which have made accusations around mis-selling a product. It has typically been products around how green they are, how net zero they are, as a company or as a bank. Coming back to the transparency issue and also the need for a taxonomy, it's quite hard to have a clear definition of a greenwash unless you can have a definition essentially and transparency of what is sustainable versus what isn't.
I hope that provides a partial answer.