What is it called when unsure of something?

There are many ways to describe being unsure of something, depending on the specific nuance you want to convey. Here are some options:

General Uncertainty:

* Unsure

* Doubtful

* Uncertain

* Hesitant

* Indecisive

* Ambiguous

* Vague

More Specific Uncertainty:

* Confused (when you don't understand something)

* Perplexed (when you're puzzled or bewildered)

* Suspicious (when you don't trust something)

* Skeptical (when you have doubts about the truth of something)

* Questioning (when you're actively seeking clarification)

* Unconvinced (when you're not persuaded by something)

Informal Expressions:

* Not sure

* Up in the air

* On the fence

* A toss-up

The best word to use will depend on the context and the specific meaning you want to convey.