All concepts of God are bound to be limited. Concepts as such are bound to be limited.
Even if you say he is infinite, what do you mean? What do you mean by infinite? Try to comprehend the meaning of the word infinite and you will be in a difficulty. Even your word infinite will be found to be finite. You can say he is unbounded, but just think, what do you mean? The boundary must be somewhere; how could it be that one just goes on and on and on? There must be a boundary -- maybe it is very far away, far far away, maybe you will never reach it, but what do you mean by "unbounded"? You simply mean unmeasured, nothing more.
What do you mean when you say the ocean is unfathomable? Do you think there is no bottom to it? The bottom is there, although we may not have fathomed it. Our ways of measurement are small, our yardsticks are small.
Any word that we can use is bound to remain limited. Hence, those who have known God, they say nothing can be said about him. Buddha did not even say this much, that nothing can be said about him, because he said if you say nothing can be said about him, you have already said something. You have already defined him! "Nothing can be said about him" is a statement, and all statements define.