unsure

adjective

1. not certain or confident: He arrived at the party unsure of his welcome.

adjective

1. lacking assurance or self-confidence
2. (usually postpositive) without sure knowledge; uncertainunsure of her agreement
3. precarious; insecure
4. not certain or reliable

adj.c.1400, “not safe against attack,” also “lacking certainty,” from un- (1) “not” + sure (adj.).