What word describes a person if they respond with possibly maybe and I'll let you know as an answer when you ask them someplace and they don't let you know either way?

A person who doesn't give a clear answer may be:

1. indecisive
2. unsure
3. socially polite - attempting to be polite when they don't really want to go but cannot say it
4. ashamed - attempting to hide that they cannot say yes because their parents or family would not agree to let them go
5. uncomfortable, feeling awkward - are socially withdrawn or don't feel comfortable in social situations