The prefix "un-" is the most productive prefix in English, appearing in nearly 2,000 words. It creates negatives (unhappy) and reversals (undo), making it essential for vocabulary mastery.
Used to create opposites: unable, unclear, unfair, unusual. This is the most common use of un-.
Indicates reversing an action: undo, untie, unlock, unpack. Less common but equally important.
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