The term "Greenwashing" has become a central battleground in climate and environmental debates, with activists, journalists and NGOs accusing businesses and governments of falsely or deceptively advertising their products, policies and actions as environmentally or climate friendly. My claim is that greenwashing is a speech act with propagandistic purpose for governments and corporations that seek to limit, silence or undermine climate and environmental policies, constituting what Stanley (2016) calls “undermining propaganda” as it initially appeals to a political ideal that it ends up undermining. I provide three observations to support my claim. Firstly, greenwashing is a way for governments and corporations to illocutionarily disable advocates of climate and environmental policy, silencing climate activists, journalists and scientists and making their assertions misfire with their audiences. Secondly, greenwashing mirrors what Saul (2018, 2024) calls covert intentional dogwhistles by exploiting existing social resentments as a tool for political manipulation away from climate and environmental policies. Thirdly, greenwashing constitutes what Shields (2022) calls conceptual domination, a form of conceptual engineering that exploits institutional authority to enforce the uptake of a revised concept. Greenwashing is an excercise in conceptual domination of green, climate and environmental concepts to make them more convenient for governments and corporations.