Uninnocent
The prefix un- makes the word "unsuitable."
The true opposite of prefix is no prefix.But, as a prefix means something added at the start of a word. the generally understood opposite is suffix - which is something added to the end of a word.
The opposite is impatient.
guilty
The opposite prefix of "incredible" is "cred." The prefix "in-" indicates negation or the opposite, so removing it leaves "credible," which means believable or able to be trusted. Thus, "credible" serves as the antonym of "incredible."
The opposite prefix of the prefix "meta-" is "pre-".
The opposite prefix for personal is "impersonal."
The opposite of median with a prefix is "nonmedian."
Innocent.
The opposite prefix of "essential" is "non-essential."
The opposite of active using a prefix is "inactive."
The opposite of "thoughtful" with a prefix would be "thoughtless."
The prefix for the opposite of order is "dis-" or "un-".
The opposite of innocent is guilty.
The opposite of judge using a prefix is misjudge.
The opposite prefix of "distinct" is "in-," making the word "indistinct."
The opposite form of the word "expendable" by adding a prefix is unexpendable.