Unsufficient isn't a word. However, insufficient is a word. It's an adjective.

Because your balls will shrink. Your eyeballs, that is.

There is unsufficient information in the question to answer it. Please restate the question.

No, anything that varies to that matter is unsufficient.

Because each type of account requires a minimum amount to be maintained with the bank. If we fail to do so, the bank has all the rights to charge us fines for not maintaining the minimum balance