Prefixes That Mean "not" or "the opposite of"
Knowing the meanings of prefixes can help you uncover the meanings of unknown words. A large number of prefixes mean "not" or "the opposite of." Some of these prefixes are non-, ir-, un-, mal-,
anti-, de-, dis-, in-, op-, and il-. Be careful, though. Not all words that begin with these letter combinations have the meaning of the prefix. When in doubt, look up the word in a dictionary.