uncertain; unreliable; inauthentic; insecure
Describes information, plans, promises, or situations that lack certainty, reliability, or authenticity. Often used in formal or written contexts.
That information is uncertain.
Please don't make unreliable promises.
The future is uncertain.
It's dangerous to make decisions based on unreliable information.
The future of the world economy is uncertain.
We had to make decisions amid an uncertain situation.