The opposite of the verb "post" is take down, remove, delete.The opposite of a fence post would be the horizontal support, or the rail.The opposite prefix of post- (after) is pre- (before, prior).
The opposite prefix of the prefix "meta-" is "pre-".
the prefix post means after
Hypo is the opposite of the prefix hyper.
The opposite prefix for personal is "impersonal."
The opposite of median with a prefix is "nonmedian."
The opposite prefix of "essential" is "non-essential."
The opposite of "thoughtful" with a prefix would be "thoughtless."
The prefix for the opposite of order is "dis-" or "un-".
The opposite of active using a prefix is "inactive."
The opposite prefix of "distinct" is "in-," making the word "indistinct."
The opposite of judge using a prefix is misjudge.