Learner's definition of UNSURE
[more unsure; most unsure]
not certain about something
He was unsure whether she had reserved a room or not.
I'm unsure about the offer.
He seemed unsure of what to say.
We're unsure (of) how to proceed.
unsure of yourself
not confident about what to do or say
She was unsure of herself as a child.
I felt a little unsure of myself when I started the job, but things are better now.