What are some of the WORST characteristic traits?

Many, many things in life and characteristics, at that, are...undesired. But what are the WORST characteristics/traits?

Dishonest (lying) - Nothing good comes out of it, always ends up bad. Lying is so awful, and it never feels right. It's also a great sin.

Disloyal/unfaithful/doubtful - not having faith, not having "rights" and "wrongs", or direction in life, truly would suck. Or even being too doubtful, about anything.

Pessimism - There is virtually always an optimistic side to thinking about something, and not only is pessimism annoying/unattractive but it is not doing anyone any good.

Instability - Goes along with being "doubtful" but also is its own. A person who is unstable doesn't know what they want from life and has no direction. If it's to a great extent, that person can very easily become annoying, rude, harmful, and manipulative.