1. They always worry

2. They try to tell you what to do

3. They live in the default position

4. They enjoy secrecy

5. They are pessimists

6. They cannot limit their exposure to bad news

7. They have very thin skin

8. They complain a lot

9. They never move outside their comfort zone

10. They love the word ‘but’

11. They are underachievers

12. They never get excited about future projects

13. They become energy vampires

14. They miss out on the good things of life

15. They put a negative spin on good news

http://www.lifehack.org/293018/15-signs-negative-people