1. A person who disguises insults as jokes.

2. A person who will never take accountability but has no problem always blaming you.

3. A person who says they want the best for you, but then works against you.

4. A person's whose words and actions don't match.

5. You can't trust a person who puts seeds of doubt in you, disguised as something else, like concern for you.

6. You can't trust a person who always tries to sabotage you, or make things harder for you. But always has an excuse for everything.

Source: Quora