Peole use vague language when they are unable or unwilling to give accurate information, or they think it is either unnecessary or socially inappropriate to do so. It does not have clear meaning; for example, telling time, "It's about half past two". It is not clear exactly what time it is. Another example would be if someone asks "What did you do on the weekend?" and anwer is " I typed some letters and things like that". This answer is not clearly understandable, the person is using vague language.