Merriman-Webster Dictionary defines greenwashing as:
the act or practice of making a product, policy, activity, etc. appear to be more environmentally friendly or less environmentally damaging than it really is.
Business News Daily is more critical in its definition, pointing out how greenwashing is leveraged for marketing purposes, defining greenwashing as:
when a company purports to be environmentally conscious for marketing purposes but actually isn’t making any notable sustainability efforts.
Greenwashing is decidedly different from green marketing which involves a business advertising a product in a way that "is generally practical, honest, and transparent, and that the product or services meets these criteria:
For more about greenwashing, read "What is Greenwashing?" by Carlyann Edwards from Business News Daily.