Chancy (adjective)

1. Involving or depending on chance; uncertain or unpredictable.
2. Risky or dangerous.

Origin:

From chance + -y.

Examples:

1. The stock market can be chancy and it is hard to predict what will happen next.
2. It was a chancy decision to invest all of his savings in that startup.
3. The weather was chancy and it was hard to plan outdoor activities.
4. The outcome of the game was chancy and it was hard to predict the winner.
5. The deal seemed too chancy to be true, so he decided not to pursue it.