Cautionistic

Cau-tion-istic/ˈkôSH(ə)n'istik
Adj.

1. a person whom is "cautiously unoptimistic" or both mildly optimistic and greatly pessimistic.

2. cautious to a fault.

Recognizing that he is growing older, he became cautionistic about the future.

Cautionist

A person who exhibits excess need to fix the outcome that may occur that could be danger.

I left my drink on the roof and didn't move it because I'm not a big cautionist.