Dis-comfort
The prefix added to "payment" to make it opposite is "non-."
The prefix for "ease" is "dis-". For example, "discomfort" is formed by adding the prefix "dis-" to "comfort", resulting in a word that describes the opposite of ease.
The prefix added to the word "approve" to make it its opposite is "dis-", resulting in the word "disapprove."
The prefix that would make "bolt" an opposite word is "un-". So, "unbolt" would be the opposite of "bolt".
Im- is the correct prefix. This would make the word immature.
The prefix added to "justice" to make it the opposite is "in-". This forms the word "injustice," meaning the lack of fairness or a violation of rights.
The opposite prefix of the prefix "meta-" is "pre-".
The prefix "un-" can be added to the word "incredible" to create the opposite, which would be "uncredible" meaning not credible or believable.
UNfreeze
The opposite prefix for personal is "impersonal."
Hypo is the opposite of the prefix hyper.
The opposite of median with a prefix is "nonmedian."