Whilst we cannot guarantee you won't go over your bounce limit, if you only use the email addresses that are verified as OK then you will receive minimal bounce backs. Such addresses will be valid mail boxes however issues can arise in the mail send process either with your email service provider or on the target infrastructure.
Any email addresses verified as unknown can still be used however some of these email addresses will be bad. A good solution would be to use the OK addresses in your next campaign and reintroduce some of the unknowns in small batches to ensure bounce rates are kept low.