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A prefix is a short group of letters that is added to the beginning of a word in order to change its meaning.
Un- is an Old English prefix that means not.
It is like a secret code that, when added to the start of a word, signifies the opposite or the reversal of a base word's meaning. For example, undo means to reverse an action, unseen means not seen, and unlock means to free something from a locked state.
Once you have identified the base word, you can usually work out what an un- word means even if you’ve never come across it before. You’ll become an expert at un- words in no time with our spelling activities!
This word list was created by Spellzone. View more Spellzone course lists or curriculum word lists.
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