A stubborn pollutant is a substance that is particularly difficult to remove or eliminate from the environment. Some synonyms for stubborn pollutant can include persistent pollutant, enduring pollutant, resistant pollutant, unyielding pollutant, and stubborn contaminant. These terms all convey the idea that the pollutant in question is not easily controlled or eradicated. Some examples of substances that may be considered stubborn pollutants include certain types of plastics, heavy metals, and persistent organic pollutants (POPs). These substances can have harmful effects on wildlife, human health, and ecosystems over time, making it important to find effective solutions for their management and control.