Answer:
mis-
Explanation:
mis + informed = misinformed (not informed)
By adding the word "not" or "wrong" and different prefixes such as "mis-", "un-", "dis-", etc. before the word, it will give you the negative prefix of that word.
more examples:
prefix: im-
word: -polite
= impolite (not polite)
prefix: dis-
word: connected
= disconnected (not connected)
