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In the case of Aquarius, one would have to know ahead of time that this sign is already one of the coldest and possibly cruelest we have.
You might put on a poker face to hide your feelings, but Aquarius doesn't have many feelings to show. It's not hard for them to ignore their natural urge to act. Aquarius is cold, hard to understand, rude, and distant.
You'll never be able to understand a Capricorn because they are too cool to read. Capricorn doesn't like to show a lot of emotion, so they do well in a world with hard facts and solid ideas.
If you want to get something done, you have to be focused and almost military-like about it. You can't do this kind of work if your emotions are all over the place.
Gemini is the only sign that can hide everything they are thinking better than anyone else. No matter what's going on, you'll never be able to tell what's going on in your Gemini friend's face.
They keep everything inside, weigh and balance what they need to know, and never show any emotion, even if they fall in love. Gemini is the winner of this poker game, if there is one.
Let's just say that Libra has had you fooled from the start. They rely on their reputation as "nice guys" until you ask them a personal question.
Libra doesn't like to share personal information, and to avoid confrontation, which is their worst fear, they'll act so cold you'll wonder if they're even human. Libra's "nice guy" is a fake, which makes them impossible to read.