Unsafe
Part of speech: adjective
Definition: not safe; dangerous
Example sentence: I have taken my friends' bikes for rides, but my parents never allowed me to get one for myself, as they think bikes are unsafe. Personally, though, I love bikes.
Insecure
Part of speech: adjective
Definition: Not secure.Not comfortable or confident in oneself or in certain situations.
Example sentence: I'm insecure about everything, because... I'm never going to look in the mirror and see this blond, blue-eyed girl. That is my idea of what I'd like to look like.