What are some of the things that Nick has recently learned about Jordan Baker regarding her honesty?

Nick learns that Jordan is disingenuous. She sees herself above others but plays the game..... she's bored and irresponsible. Jordan borrowed a friends car, left it out in the rain, and then proceeded to deny her role in the damage. Nick learned that she cheated at golf, and then realized she avoided those who might see through her, keeping her distance from "clever, shrewd men."