* Yellow impurity: Green Lanterns are vulnerable to the color yellow, and their power is weakened when they are exposed to it.
* Fear: Green Lanterns can be defeated by their own fear, and if they lose hope, their power will fade.
* Mental attacks: Green Lanterns can be defeated by mental attacks, such as telepathy or hypnosis, which can disrupt their concentration and control over their power.
* Physical attacks: Green Lanterns can be defeated by physical attacks, such as punches or kicks, if they are powerful enough to overcome their shields.
* Other Green Lanterns: Green Lanterns can be defeated by other Green Lanterns, as they are all powered by the same emotional spectrum and are therefore evenly matched.
* Anti-Green Lantern technology: Some technology has been developed that is specifically designed to defeat Green Lanterns, such as the Sinestro Corps' yellow power rings.