What is the meaning of uncertain?

Sure, here are some definitions of the word "uncertain":

• Lacking certainty or knowledge.
• Not known or definite.
• Not certain.
• Possible but not certain.
• Not definite or clear.

The word "uncertain" can also be used to mean:

• Not likely to happen.
• Not guaranteed.
• Not confirmed.

The word "uncertain" is often used in the following phrases:

• I'm not sure if I should go.
• I'm not certain about that.
• It's uncertain whether he'll be able to make it.

The word "uncertain" is a very versatile word that can be used to express a wide range of meanings.