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.
不確実な約束はしないでください。
Please don't make unreliable promises.
The future is uncertain.
It's dangerous to make decisions based on unreliable information.
We had to make decisions amid an uncertain situation.
The future of the world economy is uncertain.