(a) mark by hidden danger, insecure, unreliable Ex: Don't trust him. He proved himself to be treacherous many times. This path is very treacherous. It's easy only at the beginning, but then it leads you to an abrupt cliff.
(a) rude or not respectful Ex: I'm not going to tolerate your impertinent comments. Leave the class, please! It was so impertinent of her to argue with our teacher. She behaves as if she were the wisest person in the world.
(n) an image of a dead person that appears like a shadow. Ex:Nobody wants to buy this house. It is said to be haunted by a phantom. I had a nightmare. There was a dark forest full of fearful phantoms.
the state of being alone and away from other people. Ex: I couldn't live in solitude. I just need other people's company.
Guess all pairs making as little steps as possible!