un pleasant This is a very unpleasent situtation.
un reliable He never does what he says he is going to do. He is very unreliable.
un friendly Nobody spoke to me. They are very unfriendly.
un selfish He is very generous. You can say that he is unselfish.
un lucky This is an unlucky chance.
un ambitious He is happy doing a very menial job. He is totaly unambitions.
un happy Why is she so unhappy?
dis satisfied What a dissatisfied look she is wearing!
dis obedient They never do as they're told. They are very disobedient.
dis honest They cheat everybody. They are totaly dishonest.
dis loyal He didn't stand up for me. It was terribly disloyal.
in capable As an administrator, he is simply incapable.
in tolerant He can't work with other people. He is very intolerant.
in decisive He can never make up his mind. He is so indecisive.
in sensitive What a terrible comment to make! She is so insensitive to other people's feeling.
im mature He is very childish. He is very immature.
im patient Wait a while. Don't be so impatient.
im movable Christman is the immovable feast.