A cynical person tends to be suspicious of other people's motives and behaviors. Any good act shown to them is often believed to be done for a different reason. For example, if someone does a favor for a cynical person, the cynic is likely to think, "She is only being nice to me, because she wants something from me."
Irresponsible people are not responsible or trustworthy. They often break things that belong to other people and care very little about the situation. They are late to things and offer no apologies for it.
of or relating to amoral or conniving political principles
A Machiavellian personality is one that complex and sneaky. They are selfish and try to get what they want through crafty and mean actions. Machiavellian types are cold and detached--they seem to have no real feelings toward anyone else. In this way, they don't mind hurting other people's feelings as long as they are getting what they desire.
characterized by or indicative of lack of generosity
Miserly people love money and they don't like to spend it. They are stingy, mean and highly protective of their money. Misers would never donate any money to anyone--ever! The classic miser is Scrooge from Charles Dickens's "A Christmas Carol."
Obsessive people have unnaturally high feelings toward certain things. An obsessive boyfriend might stalk his girlfriend and check her text messages on her phone to make sure that she is not cheating on him. Obsession is liking and needing something times 10!
A pompous person thinks they are awesome and self-important. Their arrogance is flaunted around for all to see. Pompous is sometimes paired with the word, "jerk." For example, "Did see the way that pompous jerk cut in line and smiled at everyone?"
"Timid as a titmouse" is how some people use the word. Basically, timid means that you are so weak and lacking self-confidence that you are frozen in fear. A timid person has a very tough time asking someone out on a date.