Negatively, a Gemini can be:
However, if a Gemini goes to their darkest side they can become erratic, unstable, and volatile. At their worst, they can have garden variety sociopathic and bipolar-like traits, which can lead others to think they might be suffering from a mental illness.
The Dark Twin
Geminis tend to intellectualize their emotions, but a dark Gemini has difficulty empathizing with other people or understanding the emotional consequences of their actions. They tend to act without regard for others and feel no guilt or remorse. It’s this lack of empathy that leads to all of Gemini’s darkest traits.
Though a dark Gemini lacks empathy they are capable of mimicking emotions and manipulating others by appearing friendly, charming, and caring.
Dark Geminis are compulsive liars. They will stretch the truth, exaggerate, talk trash, and outright lie. Even if everyone knows what they are saying is a lie they’ll disregard the truth if the lie makes them look better or gets them what they want.
A dark Gemini will compliment you to your face and then turn around and whisper something foul behind your back. Rub them the wrong way and you can be sure they’ll have something cheeky or negative to say about you. They may even lie and spread false rumors about you.
A Dark Gemini can turn on a dime and impulsively say or do anything they feel is expedient to the moment, even if it’s cruel, reckless, improper or immoral.
A dark Gemini plays games with a lot of different people at the same time and creates chaotic interpersonal interactions. They’ll doublespeak, tell you one thing and someone else another, and play one person against another. Generally, they have fun toying with people to set up dramas.