not clear
Examples
It is not clear that intelligence has any long-term survival value.
Though it might be nice to imagine there once was a time when man lived in harmony with nature, it's not clear that he ever really did.
Reading someone else's newspaper is like sleeping with someone else's wife. Nothing seems to be precisely in the right place, and when you find what you are looking for, it is not clear then how to respond to it.
Explanations are clear but since no one to whom a thing is explained can connect the explanations with what is really clear, therefore clear explanations are not clear.
When the character of a man is not clear to you, look at his friends.
When the character of a man is not clear to you, look at his friends.