1. not known or definite; not reliable or certain
2. not having sure knowledge; not confident
3. likely to change; not dependable

Examples

• The weather forecast is uncertain for tomorrow.
• She felt uncertain about her decision to move.
• The outcome of the election remains uncertain.
• He was uncertain whether to accept the job offer.
• The company’s future is uncertain due to financial problems.
• I’m uncertain about the correct answer to this question.
• The uncertain economic conditions worried investors.