How To Use Vague In A Sentence?

I didn't understand, that was a very vague explanation.

Vague=something not clear,not clearly expressed,not giving precise meaning: The orators speech was so vague that it was not useful to most of the audience. Hope this helps you.

Vague basically means not clear.   Ex.  Everytime a politician answers a question it is very vague.

I am not sure if I saw her on that day, it was a vague shape in the crowd.
(I am learning, please comment, thanks)

My younger brother's brain is very vague.

Your answer is very vague
please describe more in depth!

This is so not clear!!!

He could hardly remember her vague image.

It was very vague when my mom told me how to have sex

My mother gave me vague generalizations when I asked her about sex.