Learner's definition of UNSURE
[more unsure; most unsure]
: not certain about something : not sure
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.